"Those that I prefer are no longer available" should also be accepted.
I agree!
This is preferable in fact. Think about the expression "the ones" for a moment ... :)
those that i prefer are no longer available should be accepted
"Those that I prefer are no longer available." not accepted. I reported it.
l'histoire de ma vie
I also reported that "those that" should be acceptable for "ceux que" and not exclusively "the ones".
'Those' is correct surely