I don't think that is true...Shaq has always praised Tim, he's just trying to create debate for his podcast..
Shaq gave one of the best quotes I've seen about Tim
"Unbreakable power forward. No [elbow] could break him. No loss of a championship could break him. Nothing could break him.
"You know how I played: I tried to intimidate guys and 'bow guys, but none of that ever fazed him. As far as giving me problems, he's right behind Hakeem Olajuwon. Not because of his moves. Because of his mind."
“I could talk trash to Patrick Ewing, get in David Robinson’s face, get a rise out of Alonzo Mourning, but when I went at Tim he’d look at me like he was bored. Whenever I run into a Tim Duncan fan who will claim Tim Duncan is the GOAT, I won’t disagree with him.”