Earlier quoted context omitted.
That’s only true if companies give some of the productivity gains back to the employee, but most companies don’t do that. They keep the profits purely for themselves. There are some exceptions.
In general without unions and workers saying "that's enough", any productivity savings never go back to workers. But of course AI is also making union/worker pressure matter even less, since it's function is to cheapen the cost/leverage of workers. So the only solution is fighting that at the political/legal/social level. Which I ain't see happening anytime soon.
There's only one way to eat an elephant: one bite at time. Putting some energy into organizing, even if only on the level of deliberately building solidarity with your coworkers and never mentioning the word "union", can and will pay dividends to somebody down the road -- possibly even you -- and also has immediate benefits in that it feels better than looking over your shoulder all the time.