Its nice that you respect this person but can we retire the word polyglot? Saying it on behalf of someone else is slightly less worse than someone referring to themselves as one.
I would like to propose just saying “well rounded”, or “multifaceted”.
Its almost as bad as people that care about Mensa.
The blog author speaks around 15 languages competently and he reads in about 15 more. Here's a 2 hr long interview with him where he touches on this topic: https://azeletmegminden.hu/040-sajo-tamas-podcast/ (in hungarian)
Maybe if you are suggesting to retire a whole word out of the language you could at least provide a (valid) reason to do so? It's not really obvious and a bit surprising, honestly.
I would like to propose just saying “well rounded”, or “multifaceted”.
Its almost as bad as people that care about Mensa.