Bluetooth dropping out with iOS 15.8 and Oticon REAL hearing aids

I am told by the Oticon connectivity resource that the 7Plus iPhone is having problems maintaining Bluetooth, because it cannot be updated to level 16 software. This is a disaster for my husband, who just purchased the hearing aids, is very elderly, and would have great difficulty adapting to new phones. Will Apple be addressing this accessibility problem for users being left behind? Being able to use the phone to communicate is essential, and being able to listen to on-line programming as well. Any feedback welcome, particularly from Apple. This is a disability issue for the hard of hearing.