There are a lot of "probably"s in the article. I was also suspicious that the author didn't say they did any pre measurement runs of the code to ensure that it

There are a lot of "probably"s in the article. I was also suspicious that the author didn't say they did any pre measurement runs of the code to ensure that it was warmed up first. Nor did they e.g. use V8 arguments with Node (like --trace-opt) to check what was actually happening.