Of course he's declining.
The issue is, he's facing the weakest young generation the game has ever known, so he's still able to pick up slams.
:whistle:
Federer is GOAT of the game, yet only plays for love of the sport.
He shall come back and enlighten / entertain us all again. And could well snag another title at SW19, mere months shy of his 40th birthday.
Agreed upon by all objective tennis observers.