I'm disappointed, but not surprised. I agree that they've probably determined the next album cycle will be the last and so they'll play the LotB dates more or less as originally planned and then come around for the album tour later. I'm sure they've seen the writing on the wall by now that they realistically can't do two more album tour cycles with Nicko being 70 next year and all.
That said, LotB is legit old enough to be a point of nostalgia in itself for some people by 2022. It wasn't meant to be like this but there's probably a huge market in people who want to see the show again after the whole corona thing is finally over and with how fondly they (probably) remember the 2018 show. Thanks to the two-year gap in touring, the band could very reasonably go out with the same exact setlist, even. I hope not, but I wouldn't expect major changes either.