Yeah, that does seem like a bad tag. And it's already mapped as cycleway:right=lane, so the new way is a duplicate feature.

As far as I can tell, most of the Boston area cycle lanes were mapped to the roadway. Almost all the new cycleways are duplicates (see https://wiki.openstreetmap.org/wiki/One_feature,_one_OSM_element)

The good news is it's almost all one user's contributions in the past 6 months. I think getting in touch with them is the best way to resolve. It looks like they are new to OSM, so they may not be aware that the roadways already have cycling tags, or they may not be familiar with the Wiki.

