The problem with blazor as I understand it, is that no, it does not compile your C# into WASM. Instead, it compiles into a standard .net module -- with as much excising of unused code as possible -- and distributes it with a CLR that is compiled to WASM. So effectively you're running the .net VM inside the WASM VM. If you do client-side blazor, which is not even MS's push anymore because they stand to make more money if you write server-side blazor and deploy it to Azure.

Do look it up yourself tho. I could have a totally wrong understanding. I haven't looked into it in some time because I've not been in a position to start a new frontend project from scratch. I would love to do my frontend stuff in C# though, don't get me wrong.