Maybe we read different articles? I thought the context was how it was hard to do GC in WASM currently, which is why we don't have many language choices. With that context, C# running on top of WASM seems pretty relevant?
Garbage collected languages have been running in WASM for a long time already, but they had to "bring their own garbage collector" to run in WASM, which increases the size of the WASM blob.
Garbage collection can now be delegated to the WASM runtime instead (e.g. see the short description here: https://chromestatus.com/feature/6062715726462976)