If I were maintaining a package and got a “request” worded like that I would tell the person to go fuck themselves. It’s extremely rude to order people around like that.
Of anything the maintainer was extremely courteous. I will be extremely wary of KeepassXC in the future given that its developers behave like this. As far as I’m concerned this is a clear cut case of maintainer bullying and I hope Debian sends a signal by kicking their -full package out completely.