Just got a game where we were a 5 que vs a trio and 2 solo

... 2% doesn't mean impossible, you know. Unless you haven't played 50 League games or more, it's pretty likely it's happened to you at least once.

Hey you weren't a solo player vs. 5 which I think it's what he said.

This is how one curate statistics to make them sound really good.

Working as intended. Solo players are fillers, then you got a 5vs5.

I don't see the problem. This is the exact reason why there is a dynamic queue else they would have a 5 player team queue.