Interestingly, in view of the discussion of the current closure of Nailsea Wall, the whole area seems to be on a proposal for access only restrictions on motor vehicles (1), even including the Kenmoor Road dragstrip, which might explain why Sustrans have kept that in their retained network.
When I first saw it in the paper on 2nd April, I assumed that someone had forgottent to tell the Bristol Post that April Fools end at midday on the first, but it seems to be on the council website, apparently the real one, so it must be real.
I can see it as plausible, because keeping through motor traffic out is probably a benefit to the people directly concerned, those living in the area. What difference it will make presumably depends on what the current proportion of through traffic is, and how local users drive.
It seems possible that there may be local objections on Kingston Seymour lines, concering the danger of cyclists to local traffic. (2)
It is probably an idea whose time will come, but not for some time, longer than the Yeo sluice crossing idea has been in the works.
(1) https://www.n-somerset.gov.uk/sites/def ... %20map.pdf
(2) https://www.kingstonseymour.org.uk/pari ... cle-route/