The reason we stand up in standup meetings is specifically to keep them short. Unless you're Russian Orthodox, you're likely to get impatient after standing up for more than five or ten minutes. The standup format exploits this impatience to create social pressure to keep the meeting to no more than about ten minutes by the simple ritual of remaining standing during the meeting.

From the 30-minute "standups" on the calendar I'm guessing this person is not actually standing up in them. Why is a manager involved in standup meetings at all, though? It seems like that could interfere with communication (as people censor themselves in order not to look bad or make others look bad) and create the potential for the manager to become involved in decisions that properly belong to the individual contributors.

"Standup" meetings where people don't stand up seem like the perfect emblem of Fake Agile: they've adopted our rhetoric, but not only don't they understand our practices, they don't even carry out the motions without understanding them; they just use the words.

(Let's see if some fake woke person who's never been to a Russian Orthodox church will castigate me for being "racist" this time because "Russian Orthodox" contains the word "Russian".)