Well, it doesn't mean bench player, it just means you play a lot of positions. It's interesting he can be nominated for both though. You'd think there'd be a cut-off for either playing one position a certain amount or not playing others enough (and I suppose there probably is in the latter case?). Seong Kim got double-nominated too.
(It being a new category it doesn't seem like they have announced how you qualify as a utility player. But Betts played enough RF to qualify there obviously).