looking further into other edits made by this account it seems like this and many other changeset's produced by this account are vandalism. many of the roads and buildings added/edited by this account have alignments that aren't aligned to any available imagery (in iD) in the area. so either this contributor is adding buildings have been built within the last year (or possibly less) or this is vandalism. this is especially clear at Lake Mead were were edits made by this account in two different commits create geometry that I severely doubt the correctness of. If the Lake Mead edits are "correct" as in their not vandalism then they are extremely sloppy to the point were there is at least 1 multipolygon loop in the geometry that I saw. 
This user has also added residential areas that have really odd shapes and residential roads that are in the middle of nowhere and do not connect to other roads that intersect with them. all of this compounds to making me think that most if not all of the edits by this user are vandalism. 

I am just not 100% sure since most of the edits I saw from this account when looking through on OSMCha are in Las Vegas and Buenos Aires which are cities I know next to nothing about so I cant tell what's being built were. but still based on the edits them selves this account seems to be doing vandalism. 