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The video talks about making assumptions. Including ones that make no sense.
Do you think I could be living the life I am, doing the work I'm doing, and maintain a large body weight with spindly arms?

You plan everything? With what? Your brain, and the rest of your body that factors into decision making.
All that plus some ghost in the shell you call a soul, is likely what you'd say constitutes you as an individual being.
Where did all that come from? Your genetics, and the way your upbringing affected their expression.
So, if I were to take you at the stage when you were still a zygote, and subject that to all the same environments that you were exposed to, would I not produce an exact copy of you right down to the most minute of details?
The answer is obviously yes. Furthermore, I could reliably predict every single ting you'd ever feel, think, say or do throughout your life.
You, and everything about you, including the choices you've made, all comes down to a simple equation: genes + accumulated environmental effects = you.
The question of free will is really whether our actions are able to be predicted, and given sufficient information about you, I'd agree that they are.
From there we come to the world as it exists today, where the science of controlling human behavior with perfect reliability at the individual level is being perfected.
Unfortunately it is with the intention of being used against us to drag the world into a totalitarian dystopia, where only a few of the wealthiest and most powerful people are the only ones who are above being manipulated in such ways, for they are the ones manipulating everyone else.

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Well, it's a "yes and no" kind of thing. Likely they are capable of changing any pattern of behavior and it would be wise for them to be treated as if they were responsible for their past actions by everyone (especially themselves).

Whether that happens or not the actual truth of the matter is that free will doesn't exist, now, they are responsible for their actions, for it was their bodies that committed them, and they are likely capable of doing things differently, depending upon their natures and whatever circumstances they are in or would later find themselves encountering (like, if you lost your legs your dream of professionally dancing ballet are over).

Also, everyone is running on the same rules, nobody has free will, not the criminal and not the police officer who stops them. To be fair determinism doesn't hold any significance with regard to the fairness of crime and punishment. We don't have a justice concept to "give people what they deserve", if that were true we would either not care at all about actual guilt, since catharsis could come from punishing just about anybody, or we'd be far more draconic with our policing, punishing people more for their unpopularity than for any crime they committed.

We do things to rulebreakers because of the positive effect these actions have for our society as a whole, the most basic function of government is to enforce the laws by doing so. It's in the name, we couldn't have any civilization at all without people visiting consequences upon those who break our laws.

Remember the basic premise of determinism, that if you are the product of genetics and environmental influences, these consequences are just another experience that will change the way you would be from then on.

I'd advise against taking advice on how anyone should behave from a statement of how things are. It all may be operating deterministically, but it could only matter to those who someone with perfect knowledge that would allow them to accurately predict the future, for the rest of us the unknowns prevent the lack of free will to have any practical utility.

I think you don't understand the argument against free will.

The argument is that your behavior is deterministic, thw result of your genetics and its interactions with all the environmental experiences it has ever encountered.

Of I were to take the zygote you used to be, and put it through all your life experiences, it would do everything you did, and turn out exactly like you in this moment.

It's the Laplace demon claim of determinism applied to people, that whatever you are at any moment is simply the invariable output that results from the input that was your biological nature plus your experiences.

Most people who argue for free will show a clear misunderstanding of what is being claimed by those who say it doesn't exist.