I'd think it means he's out on tour with that records' particular songs that are a large portion of his set list helping to promote sales..
As opposed to just being on tour with nothing new to promote.
I think.
I find it hard to believe none of his tours after 1967 weren't associated with promoting a new album considering he toured every year and had a new album every year...
Seems to be a very odd statement...
list of albums and release dates:
http://www.lightfoot.ca/alblist.htm