Even if they analysed slack+chime log activity. I guess they’ll explain it away with something like “working from office significantly reduces the need for online chatter”.
The important caveat is that we ALMOST ALWAYS need to do Chime meetings/Slack chats because our team is split across three cities -- Seattle, Arlington and Chicago. 2/5 of the team is stationed in Seattle office; 2/5 in Arlington; and 1/5 in Chicago. Not to mention that a bunch of folks from Hyderabad in India that we have to continuously work with. On top of all that, folks who are returning to the office can pick one of any weekday to go into the office (the other two days are agreed upon as Tuesday and Wednesday), so some folks are in the office on Monday, some on Friday (nobody choose to go in on Thursday from my limited observation).
That is, after all, the entire point of RTO mandates. (I am pro-remote and fortunate to work at a company that isn't RTO, but I will say that it is a breath of fresh air and notably higher-bandwidth conversations that are enabled on the few times per year that we get together in-person in an office.)