I thought I revised things so it would work, with a blog/index-R.xml category feed that is the same as r-nimble.org/feed, which I think is what r-bloggers uses, but our nimble 1.4.0 post was not picked up. I've contacted the r-bloggers maintainer.
If I don't hear back soon we have to decide whether we post our teed-up derived quantities and nimbleQuad blog posts without r-bloggers picking it up.