An excellent article from Liberty Ballers outlines what I believe is happening here
I believe the Sixers are trying to pull one over on the Bucks. Sam Hinkie and his team are notoriously tight lipped this time of year as can be witnessed from their Jrue Holiday trade that came out of nowhere during last years draft.
This year I believe the Sixers have been targeting Exum the whole time and have been leaking information about how they want Wiggins all in an attempt to fool the Bucks into not taking Exum. They even brought Exum in quietly the same day they had Wiggins in for a workout so that the media would be all over Wiggins. Now that Embiid is injured "reports" are being leaked that Philly want to trade up to the top 2 to get Parker or Wiggins.
All smokescreens from a very astute evaluator of talent in Sam Hinkie. From a Bucks perspective as I have said before there is a case that can be made for Parker at #2 but if he goes to the Cavs then the Bucks have to select Exum.