While this is true, I'm pretty sure the referenced poll was conducted well before that was announced. In fact, I've heard internal criticisms of the opposite direction.
The prospect of a full time shift to remote was not communicated as context for the poll. Employees answered the polls thinking they were talking about how they'd go to the office given COVID-19 (a lot more people saying they'd do 50/50, when in reality, that just reflected their lack of comfort due to the disease).
Companies should be sure not to confuse actions people are willing to take due to a pandemic to be what they'd do in a post-pandemic world. Same thing with productivity: just like we don't know the long term impact of this disease, we also don't know that employees will remain as productive as they've been so far.
This is a very biased interpretation. Your salary may not be adjusted if you work in a similar CoL area. Only if you move from HCoL to LCoL (and vice-versa!)
Too many people assume remote work always means working somewhere far away from a major urban city.
Zuckerberg was recently in the press saying he wants Facebook to pay remote workers less (https://news.ycombinator.com/item?id=23264521). That could skew the results a little.