I do believe there are people out there for whom "living their best life" truly does entail spending almost all their time in front of a computer.

Nobody shamed Chopin for spending his life in front of the piano. Some people choose to dedicate their lives to one single thing, and often those are the people who end up contributing the most.

Maybe Chopin took long walks in the garden every once in an while.

And maybe, just maybe, universally acclaimed musical geniuses are not a good point of comparison for common folk.

Hell, he ran off to Mallorca with George Sand. My impression is that composers work intensely, but manage to find time to do other things.

That's not the comparison as far as I understand it. The analogy is of someone that dedicates all their time to becoming the best at their craft, like Chopin. It's not about being a genius.

They can't because of hustle culture.