The math isn't that clean.
the department deployed at least 101 personnel to Renee Good’s memorial... The deployment was part of Operation Trust and Safety
From later in the article:
MPD’s own cost memos written at the time continued tracking overtime under Operation Trust and Safety after Jan. 11, with costs accumulating through at least Jan. 25.
So the overtime hours were over a longer period than four days and involved more than 101 cops. There's mention of drone pilots, for example, which probably aren't included in that 101 number.
I think a better headline for the article would have been "MPD uses nearly its entire overtime budget on policing protests," which the article gets to eventually. Emphasizing just 101 cops and 4 days is either sloppy or getting loose with the facts in a way we'd jump on if it wasn't from a friendly source.