PvP is RP.
Storytelling is RP.
Fighting Kitins is RP.
Crafting weapons is RP.
Harvesting materials is RP.
If you replace is with can be, I would agree completely.
However, none of those activities are inherently roleplay. All of them can be, and can be incredibly detailed roleplay if the player is willing to put in the effort.
My two dappers worth
Phaedreas Tears - 15 years old and first(*) of true neutral guilds in Atys.
(*) This statement is contested, but we are certainly the longest lasting.
<clowns | me & you | jokers>