Can someone explain to me why this is not a defensive foul

For those of you said this is not a backcourt violation read the text and explain please I'm genuinely curious

A rare two 3-second defensive violations on two consecutive possessions

Castle Fouls SGA on the Inbound

Offensive foul called on Wemby for contact with Josh Hart overturned to foul on KAT his fifth

Outrage over an actual foul is crazy

HIGHLIGHT KAT picks up an offensive foul his 4th foul in the game replay