I'm a psionics fanatic so knew well about Cryo so didn't occur to me that it might be a variant till you mentioned it (the variant isn't as well known to me as the official. I took one look at the variant years ago and rolled my eyes).
The variant comes up frequently when the class is mentioned, recommending that folks swap Pyro out for Sono- (sonic damage), to get around resistance/immunities.
All that I say applies only to myself. You author your own actions and choices. I cannot and will not be responsible for you, nor are you for me, regardless of situation or circumstance.