An interesting read. Of course just an personal opinion as the author said, but I think he is correct in lots of his points.
I noticed that I think / feel like this myself sometimes, even while I’m a frontend dev myself.
Fortunately I’m in a nice team that values my frontend skills that all the other full stack/ Backend devs are missing.
Did you notice this bias / devaluing of the frontend work yourself?
To be clear, I’m in agreement with you that CSS and HTML are not programming languages and also that saying that isn’t a value judgement.