Yah I dunno about the K-type listing, it definitely looks like an RTD (the 3wires)
Ive used thermocouples outside their working range and they dont read the temp correctly (non-linear range) Im guessing that it would be the same for an RTD, but like Jrems said try it out when you get it, I mean you already ordered it afterall
even then, how often do you care about temps lower than 122F? the only point i could think about would be chilling, but you could always add an analog thermometer to your kettle