Not even sure how Dembele vs Salah became a discussion. One is an all time PL great and arguably best winger of PL era. The other is world's oldest talent.
Birdy frequently rationalizes Dembele's poor end product by telling us he's a "touchline winger", and therefor it's not his job to provide goals. I pointed out that every world class winger is capable of (and frequently do) playing on the touchline like Dembele does, alongside scoring goals at a consistent rate because they have the intelligence and finishing to be productive inside the penalty area. Salah, Neymar at Barcelona, and so on were used as examples. Dembele doesn't score not because he's a "pure winger", he doesn't score because he's a limited player with poor movement and finishing (and therefor not world class). Then Birdy and others took that and started a debate over Salah and Dembele. In other words, you can blame the debate on Birdy's irrational fixation and adoration for Dembele.
I think someone else said it perfectly, Dembele is a glorified Adama Traore at this stage.