There's plenty of quieter switches, and even some silent ones if you're that concerned. Gateron/Cherry Reds are quiet enough for most folks, but you could spend a little extra to get a board with Zealios or Zilent switches. Keep in mind that bottoming out the key will still make a lot of noise, but with a bit of conscious practice one can learn to type without it, significantly reducing the noise any mechanical key makes.
Given that there's variance among even the same key switches, as well as differences in sound based on the construction of the keyboard the switches are placed in, possibly even based on the surface the keyboard is placed on, the model would probably have to be trained specifically for a given target.
Since I'm working from home, I have much bigger things to worry about if attackers get access to my physical machine to train their model lol