The parent comment isn't comparing fully remote with fully in the office. The issue they see (and discussed in the linked twitter thread) is in a company with some office, and some remote, remote workers will be left out from activities that take place in the office, and those physically present will do better career-wise.

The parent isn't, but considering the full range of options is still a useful discussion to have, which is why I added my comment. It all comes down to money. The twitter thread prophesied losing all of your best talent in a half office / half remote setup. Your best, most skilled talent sticks around first and foremost for their premium compensation, above all other factors.