He is definitely serious about it. These aren’t offhand remarks, he has mentioned it in several interviews with more detail and conviction with each new interview. A couple things are happening: one is that they’re setting expectations. If you go see Maiden on the Senjutsu tour, you’re going to mostly get Senjutsu. But I think the band is also testing the waters. There is no doubt that Maiden has social media folks on the FC forum and on here gauging fan reactions to comments like that. If they’re going to do limited engagement concerts for Senjutsu, they need to know that it’s something the fans are actually interested in and will pay/travel to see.
P.S. if any social media Maiden folks are reading this, please bring the “small scale” Senjutsu concert to the west coast of the USA and maybe bring a couple unplayed songs from the 80s while you’re at it?