The article describes WebAssembly at a low level and use the assembly language wast. Therefore, it is still relevant if you want to understand WebAssembly at this level. The specification has not changed in the last 2 years.
However the tooling around WebAssembly changed a lot. E. g. the compilers start to fully support the wasm target.
I don't think the poster you're replying to was serious, rather they were trying to make a joke (which I agree does not add anything to the conversation, however).
https://github.com/CraneStation/wasmtime/blob/e530a582afe6a2...