I sell frequently on Marketplace. I don't care if they have my number --- it's a google one that they get anyways. I very rarely have scammers attempt to chat anyways.I've had 3 FB sales this week.
I Always check join date. If it is the current year date I typically don't reply, unless they already have feedback and some type of interaction history, items for sale and a recent FB postings that arent just bs traffic.
I don't trade numbers or addresses.
I use messenger.
I meet in a business parking lot that has good cameras or I tellem to meet at the local PD if I am suspect of their shenanigans
I would say it's not entirely crazy (on it's own merits) that there was a redirect to a husband. Sometimes my wife lists things and I get "meetup with the random person at QuikTrip" duty after all. If she lists something of mine for sale especially.
That said, if a deal is too good to be true, like a $40 blackstone griddle, then it probably is indeed too good to be true.