Wow, this is an absolutely wild offering for an extreme niche.
Were this keyboard at least a TKL, I would jump on it without any issues, but that's tiny as is.
As for stabilizers, over time I don't mind them rattling, my main problem is if they make the key press harder or if it makes the key press feel weird instead of solid.
I think only Das Keyboard has this figured out well, though I hate they don't have a hotswappable keyboard option, but that alone justifies it not being hot swappable. Maybe Logitech's higher end Pro X, but that one has a huge caveat on programmability.
If this one is as solid as those, I'd be OK with it regardless of the rattling, but that's a super personal preference.
I'm extremely biased on that as I used to use Cherry MX made keyboards with black switches for the longest time, and I don't know they make those anymore for general availability, just for enterprise, and I'm not even sure they make them anymore.