Now that you mention this, it makes sense to assume pogba's sale was contemplated long ago. The ad was filmed before Pjanic's arrival, probably when the season was still going on but if that's the case then why is pogba not in the video? He's our "best" player and the most marketable one, he should be in it. So that leaves us with Pogba wanting to leave (or we wanting to sell) way before the season ended and it's likely the deal has been sealed for a while and they're just creating a lot of hype to sell more shirts and make fans suffer.