As someone who loves Abacab, I'm afraid I have no idea what that means. The album is as 'relevant' as any other album. If they played nothing from it on the last few tours, that does not necessarily mean the band shared your dismissive opinon of it. .
I agree with you, not sure how it’s not a relevant album in the Genesis catalogue. Dodo/lurker, Me and Sarah Jane, Keep It Dark are pretty solid Genesis tunes in my opinion