If I am understanding the parent, the point being made is this may be less of an option for many if companies revert. If there aren't many opportunities to work remotely, this will become more of a perk, like free lunches, and not something other organizations will compensate you for. Not everyone may have a choice to demand more money if the number of WFH options are very limited.
Apple and Google might be able to pull it off but run of the mill non-unicorn companies? Not convinced.
Whereas Facebook made a big announcement that they were renaming the company Meta. They asked to be called Meta.
Hiring a CFO from the banking industry did make it more difficult to get the free food, though. The cause and effect there was immediately noticeable.
With labor having less power, it's likely that the members of senior management who don't like WFH (for a multitude of reasons right and wrong) will have more sway in the conversation.
There seems to be an implicit assumption that WFH is somehow less productive. I've not seen much evidence of this personally. It certainly makes management harder but it's a small price to pay when it's saving a bunch of travel costs for the employee and office costs for the employer