I'm not sure what OTM stands for. First they called it authentic, then OEM and now its OTM. However, the flavor is fantastic, it wicks very well, and has juice control so that should prevent the possibility of flooding or dry hitting. I love it.
It is the authentic, in a way.
OTM used to be OEM (Original Equipment Manufacturer), but the creator got mad and threatened them in some way; Their response was changing it to OTM
So yes, it is the real deal