Where have you heard that argument? That is absolutely bonkers. Why didn't they just use css as intended and collect all these inline styles into generic classes? Or turn on gzip-compression?
If you believe the size argument, and care more about short term revenue over developer productivity or happiness, it makes sense, I guess.
[1] https://acss.io/frequently-asked-questions.html#what-are-the...
Too many engineers and not enough actual problems.