Where are you getting this? It’s not an argument, doesn’t have any conclusions and doesn’t require any though experiments. It is not semantics. Most attempts to dodge it are semantics though.
Stop pretending the hard problem being a problem is some cut and dry thing. It simply is not.
And I'll generally side with the philosopher who understands more about how actual brains work, which is clearly Dennett.
Mary's room, The Chinese Room and friends seem designed around fundamental misunderstandings of how the brain, psychology and computation actually work.
They're designed to evoke a sort of visceral reaction. "Of course Mary won't understand what it's like to see red". But once you dig into the details of it, the logic breaks down.