Kind of hard to tell...
I mean, WWE already did this with Reigns by having Rollins making some remarks during a couple of promos on RAW so it would be no surprise for them to do something similar with Lesnar. On the other hand, though, Jericho's reaction came off as if he didn't expect that specific comment and his reaction "you might get in trouble for that" may hint that Orton took it upon himself to throw that line out there...
Idk, I'm just going to assume it was scripted and planned all the way...