Okay, let's follow this reasoning. Here is part of the text of "Fade To Black" from Azerbaijan:
"Stay
The story barely started Can't you stay?
Do you really want no part of this?
Oh, so sweet reverie "
The word "Reverie" is a word ... French!
You can tell me "Reverie is also present in the English language and in the vocabulary" but ... apart from that both French and English have the same meaning, during the Norman domination in England they spoke ... French! Therefore in the English language French words are not rare
Therefore at the Eurovision Song Contest 2022 French is still present!
I only checked a few songs. If I had deepened perhaps some other French word is present.
The French language, however, can be considered represented if there is both a regional language and a piece that mixes two languages in a balanced way. Both of our examples are forcing. On the presentation page of the songs of the Eurovision Song Contest 2008 "Divine" is cataloged in English because English is predominant. If it weren't so ... Would ABBA's "Mamma Mia" also have been sung in Italian?