I have to say, https://www.openstreetmap.org/node/29027798/history does look like a mini-roundabout rather than an actual roundabout on the imagery (unless that's out of date, of course).
Perhaps this would have been a good candidate for asking about at the forum https://community.openstreetmap.org/c/communities/uk/86 first?  Sometimes what's mapped does need changing (the bus gate mapped by another mapper as a police checkpoint in the other changeset might be an example of that) and sometimes it might not (here, unless the road's changed).
"how to map things" in OSM can be tricky, and we all make mistakes at first (well I certainly did), so sometimes it helps to ask.