All datasheets for all parts contain a clause like this. Have you ever wondered how manufacturers get lifetime estimates? They use an accelerated aging process

All datasheets for all parts contain a clause like this. Have you ever wondered how manufacturers get lifetime estimates? They use an accelerated aging process which basically just means they run the part very hot and back-compute how long it would take to fail at normal temperatures. This is an industry standard practice that is (supposedly, I haven't verified) well backed by science. Running a part at elevated temperatures is somehow physically equivalent to running them longer at lower temperatures. Heat and stress degrade silicon junctions. It's just physics. There's nothing particularly sketchy or unreliable about this specific part on its own. Probably whoever designed the amp circuit just made a mistake and under-spec'd this part.