Diaz 3 will be there even if Conor starts losing & still be big... so there's no sense doing that after a win. To your point though, maybe he's just using it for alt reasons with no intention of fighting Portier.
What's top on my wtf list, is that last March or April, Dana said that it would be really hard to give up a McGregor gate during shutdowns. Mac makes 18 mill gates... compared to the standard 2 mill or less. So why now all of a sudden the UFC wants to book him at the height of flu season where you know there won't be any gates just yet.
My point is that I agree this is a ruse... but I think it's due to just keeping his name in the media & on the tip of everyone's tongue than the idea that he's going to actually try & fight anyone while lockdowns are happening.