I have these, for an office. Yes they are silent if you slowly push and release a key, but thumping away at 50-60 wpm still makes a huge amount of noise, even with o-rings installed (although a lot quieter than blue switches which I used to have).
I have topre switches, so a bit different experience, but a friend of mine had "shown off" that indeed, you can type silently on them. It's the art of not bottoming out which is something like 90% of the noise.
There are some silent, tactile switches, but I think they're a bit more obscure.
I made my ergonomic, split keyboards from a kit[1], and chose Aliaz Silent switches [2]. It's around the same noisiness as everyone else's keyboard (Apple, cheap Dell one etc).
(There are almost certainly other options — the choice was a bit overwhelming when I decided to buy a DIY keyboard — but I'm not in the hobby of collecting many different keyboards. Various Reddit groups can advise.)
