I would venture as far as to say that the most popular languages might not be the most used by software engineers, as in, people this kind of article would be aimed at.
I'm not fully sure what this means but perhaps you're right about Python given its use by data engineers, academics, SREs (though they're mainly Go these days ... which also lacks fully stable native SIMD support). Otherwise though I'd say the rest are used almost exclusively by software engineers. Unless I'm misunderstanding you.
Still hidden behind an experimental flag but SIMD is fully functional in Go: https://pkg.go.dev/simd/archsimd
> This [...] applies to any programming language. Support for SIMD instructions varies by programming language
This is a very pedantic nitpick because this article is good (& getting SIMD support across more languages would also be good), but the "every programmer should know" line feels a bit odd when neither of the 2 most popular languages natively support SIMD.