Totally agree with what you’ve said.
Sure yeah, if you’re getting the equivalent of overtime or time-and-a-half, ok, it may become worth your time and like you said you are getting compensated for the extra effort and sacrifice.
But the author of the article is talking about salaried FTE Google employees. I’m a salaried tech employee, I don’t earn extra comp for working weekends. I assume that is the norm.
Hence why the authors attitude is indeed entitled, and not the employees, as you’ve stated.