Yes, Rosella Crimson will come true from saved seeds. My source (not Victory Seeds, but a reputable seller) managed to get red currant tomato seeds into the same packet as Rosella Crimson. I saved seeds separately from both of those, so hopefully anybody who got Rosella Crimson seeds from me has the real deal.
Were your Rosella Crimson seeds from me? I sowed some of them just last night... if there's an issue with germination, I do apologize!