And you discounted two people who have experience with advertisers, ergo I can only assume that nothing short of direct confirmation from employees of those companies will satisfy you because, guess what, you’re not special. They don’t have to justify or explain anything to you. They said no, you had the best likely explanation from people who have managed to do the ad thing in the past (and one of whom does it ongoing) but because it didn’t meet an unachievable bar of confirmation, it’s not good enough.
I have never seen a forum, ever, get ads with that few posts, not even 15 years ago when forums were still hot property.
And if you’d read our responses, we weren’t telling you your content was rubbish, we were telling you that you need more of it. Much more.
Why would an advertiser pay you money to advertise on a site that has so little content no one goes to it?