You are correct! Good research! K276EL just filed for its license to cover about 2 months ago. It, like all translators in the commercial band, has to rebroadcast signals it picks up over the air. This one rebroadcasts KZLV 91.3.
As for it being close to KTXX, yes, it's close to KTXX, but it's outside of its protected signal contour. Translator spacing is also determined a little differently than the spacing tables used for full-power stations. Translators don't have a set spacing requirement in terms of kilometers or miles; they're determined based on signal and interference contours. They also have to sign off or find a new frequency if they cause undue interference to full-power stations, and they have to accept interference from full-power stations if they have any.