You lucked out!
'Texas Star' is not a real variety. It is a name that TyTy made up on their own, just like they make up hardiness claims as well. It is an 'Orinoco' banana, plain and simple. It will survive a zone 7b winter, with mulch for protection, but I would be simply astonished if it survived a true zone 6 winter, even with mulch. Maybe they mean that if you build a greenhouse around it, it will survive a zone 6 winter, lol!
