I did read the biography a few years back but never noticed he also mentions it in the News section of January 2017:
January 4th 2017
The 40th anniversary of Ultravox! The bands first album.
I, after 43 years, decide to do what all the other members have done over the years. Dump it!
To me that really sounds like he's very disappointed in the other band members and he would have wanted to continue if the others had put more effort into it.