Given that they compared rust-wasm on a selection of a rather odd number of nodes (673- what went into that particular selection?) and the title of "lies", it just reads as someone at fastly is bitter.

All the article does (which they even admit, blaming it on "beta" status) is that, if you want to run javascript on an edge server, cloudflare is faster. On top of that, you can do it in a free tier, whereas fastly says their free offering is only meant for a short trial.