Comment on Show HN: I built an app for when I talk too much in online meetings
To answer your question without knowing any context: I would err on the side of it being received as rather passive aggressive.
I do not recommend using the app (especially not without context) as a proxy for a difficult conversation that may have to happen.
Since the question came up earlier, here is my full take on this situation: https://news.ycombinator.com/item?id=32097859