Unless you have reason to believe your skepticism comes from a different place than theirs, you should update towards gatekeeping being harder than you think.
Unless I have already heard the information you have provided and updated on it, in which case updating again at your say so would be the wrong move. I don't tend update just because someone says more words at me to assert social influence. Which is kind of the point, isn't it? Yes, I do have reason to believe that I would not be persuaded to lose in that time.
Disagreement is of course welcome if it is expressed in the form of a wager where my winnings would be worth my time and the payoff from me to the gatekeeper is suitable to demonstrate flaws in probability estimates.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.