If the sound disappears when you turn the steering, like going around a corner, and then reappears on the straight, its likely the steering shaft boot. There is a TSB for the 2017s for this. I really don’t think it’s a predetonation noise or seat noise, if it sounds like it’s coming from under the steering wheel.
An alternative solution is to pump some lithium grease into the seal yourself to see if the noise settles down. If it does, that’s your issue.