And you would be absolutely correct in that assumption. There is no requirement,
AFAIK, for flight attendants to attain any ICAO proficiency level whatsoever, as they are obviously not part of the flight crew and could just speak an obscure Chinese dialect as far as ICAO is concerned. I'm sure that is actually the case for many f/a in mainland China.
Personally, when I travel to any country where English (or German, or Italian) is not spoken as an official language, I do not expect anybody to be able to speak English (or German, or Italian) just because it would please me if they did. I wouldn't also claim that "no information was given" just because I am not able to understand the language the information was actually given in. That would be a bit too egocentric even for someone as myself.
I understand that French is their national language but......
"There was no information. The cabin crew didn't speak English. They said they are a French Airline and only speak French".
the few times I have had the misfortune of having to fly with Air France, the FA's spoke perfectly good English and could understand what you were saying to them but choose to do the 'shoulder shrug' and say non comprende. That's their right but in a panic situation, playing dumb is not acceptable if the crew were capable of answering questions in English.