I have 2 accounts, one for practicing openings and the other for serious games. The only real way to get to 1600 is if you practice a lot so that you could outplay oponents <1600.
I wouldn't make that public knowledge, that's against the rules.
Indeed, he might find he has zero accounts fairly soon. (Although if I was Chess.com, I might be tempted to troll him and close only the higher-rated one
)
thx