The TL;DR is "Yes, Python is slow but this is why is doesn't matter, in these scenarios where it being fast doesn't matter".

And:

"Python is by far the fastest to write, cleanest, more maintainable programming language I know ... I rarely feel Python slows me down, and on the other side I constantly marvel at how fast I code with it compared to other languages."

In other words, "I don't know much about anything else other than Python."

What a pointless article.