Technically, everything he says during promotion means nothing, it can all be an act. UFC haven't commented on this yet, it's possible they asked him and he was like "lol wut yeah nah".
Meanwhile Vettori's somewhere stressing out, not getting any clear facts, thinking they're about to come to him with an offer, going through a rough cut himself, possibly missing weight.
Remember, Vet's one of the biggest cutters himself:
https://forums.sherdog.com/threads/compilation-of-fighters-cage-weight-redux.3977251/
2nd only to Costa at MW. So it's not a bad strategy to mess with the weight to get into Vet's head. But, again, wishful thinking here. Cause otherwise, this is so unprofessional from Paulo.