of course he can do whatever he wants to do and during this time he overcame a cancer battle and divorce process and tragic death of his wife (exwife)... these are life stopping events and he didn't stop a bit which shows his extraordinary determination and life force.
but on the other hand, he puts his solo carreer on the very side of the things he is doing; for a long time he was like a ceo for this airline company, going to meetings, being a business man, investing on that zeppelin idea... and all that standups, writing/promoting the book, motivation talks, writing animation scripts for maiden, making or organizing the beer franchise... this project was under the shadows of all of these.
but anyway we got the album, it's not bad at all, and i'm grateful that he is still making music. and hope he can make another one in a shorter time.