Agreed, its not a barrier to sponsor. But it would be a good idea if he can get enrolled in either French or English classes prior to applying. They will see he is currently trying to improve his language as a plus. You have roughly a year before he would be approved, that is ample time for him to learn basic communication skills in either language. Both are very similar to Spanish, many words are the same or at least stemming from the same root. I don't know if you also speak French, but you seem to speak English and can maybe practice with him
It will be so beneficial for him (and you!) when he gets here if he can speak the language (either one) in terms of finding work and integrating. If you are planning to live in or near Quebec, I'd recommend continuing with the French but for probably every other part of Canada English is more broadly spoken and would open more doors for him if he could communicate in English.
