Unless he uses the same custom assembly except with an indirect call, it’s not a good comparison. We can’t be sure the increase in runtime is due to the indirect call.
Can you cite where in the article it addresses the fact that the assembly snippet is not an apples to apples comparison with the C code?
> If you have a specific criticism to make
Pointing out that the assembly is not an apples to apples comparison with the C code is a specific criticism.