According to this (unpublished) study, weight training may help if you’re not doing anything but low/moderate intensity cycling 4 d/wk.
According to a number of other (published) studies, it does nothing.
AFAIK, no one has compared doing resistance training versus more intensity on the bike (which is the real question).
IOW, I shared the preprint because 1) it was timely, and 2) it illustrates the limitations of the research in this area, not as an endorsement of resistance training.