The roads in this changeset do exist. The issues are likely a misunderstanding of the conditions on the ground and how to represent them in OSM. (And I'd blame some of the phantom bridges on overly aggressive validation in iD.)

I haven't checked other changesets by this user, but I did notice that they like to use some very recent imagery sources that have roads that don't show up on the typically older Bing/Esri/Maxar imagery.

If you have evidence of improper changesets even after considering the most recent Sentinel-2 imagery, I'd suggest that you comment on those changesets and follow up with DWG if you cannot resolve the issues.