I don't see anything of substance in those tweets.

It was slower with the fewer threads, and giving it more threads made it even slower. Celebrating this as awesome efficiency is..."interesting".

And saying that "being fast is not the goal" doesn't debunk the result or make its methodology flawed. Quite the contrary, it raises a good discussion about what those goals may be and clears up misconceptions, because apparently many people do believe it is faster (and for many async-style APIs those claims are either made or at least strongly hinted at and not disavowed. Looking at you, GCD/libdispatch).