AMD aren't stupid to lock FSR4 to the 9000 series only

Please tell AMD isn't going to be stupid to lock FSR 4 behind the 9000 series only. The 7900XTX is a great alternative the 5080 and it would be extremely dumb to lock a powerful card to an old upscaller, especially when Nvidia DLSS4 works on all RTX cards. Maybe I'm giving AMD too much credit, but that would be the dumbest decision they ever made and it would devalute their old GPU models knowing that their competitor is still supporting older cards.