If I climb into platinum or diamond in flex q does it actually count??

I've been a gold player the past few seasons. This season I hit g5 then j switched to flex to get gold there too. I went 4-6 in my placements and got s5. Mostly cause I played with friends who weren't very good. Since then I've been winning most of my games. I skipped every even division amd im g3 now and im assuming almost g1 since im getting 28 points a win and lose 12 when i lose. I have friends telling me that it doesn't mean anything and flex is a trash q. So I'm curious as to what other people's opinions are. Personally I think If I'm playing with diamonds and plays and against them and im winning I deserve to be there and can consider myself those ranks if I manage to climb there in flex q