Triploids supposedly won't pollinate a normal plant, but can pollinate themselves, at least I think that's how it works.
Either way, sure sounds untested to me.
And adding the "RECOMMENDED FOR OUTDOOR USE ONLY" sure sounds like a dig/scapegoat to blame indoor growers for their lack of experience or whatever. Why would it even matter indoor vs outdoor? That doesn't make any sense at all. They 100% tried to pull a fast one, and blame the growers. Low, scummy behavior.
Then again, HSC is just another Spanish seed maker at this point, so we shouldn't be that surprised.