Taylor didn’t throw shade at him at all. I’m pretty sure she didn’t. Unless there’s an interview I missed.
Maybe what he was referring to was this video-
Where around 3:45 the interviewers asked Taylor how she feels when people say that she writes about boyfriends. Maybe the interviewer was referring to Olly Murs but Taylor never mentioned Olly’s name at all.
Olly honestly just wants publicity. Like he has none so taking a stab at the biggest star in the world right now is the fastest way.