Well least he was honest about why he doesn't have the current big United bonus in his "Best Credit Card Signup Offers Right Now" (bolding mine) even though one can clearly argue it's better than almost every single other "best offer" he has on the list (at least for the 70k + $50 version)
I don’t have links for them [the UA cards being offered] and simply have observed reports of othres (sic) as to what’s available, but with 70,000 miles on offer to some people this is noteworthy even if many offers are targeted.