Must disagree. As someone working in an MBB, the total comp of a potential exit is 100% a daily topic of conversation.
IMO initially it's possible that folks will not be deterred but that is truly a matter of time and space for the knowledge to be available, make its way through and then impact people's behavior.
It sounds like you're disagreeing with something I didn't say. The person I replied to said that if small and medium businesses published compensation information, it would cause job seekers to prefer FAANG companies less. I said that was not true -- FAANG companies will still be very attractive to job seekers even if other businesses publish their salary info. Job seekers already know that smaller companies cannot match FAANG pay, and the exact amount of the deficit is not very important.