It is interesting that Matt at Ag says "new in production" and not new as in "new/old stock" So like you I wonder who makes it as well. I used to like Vista. As an Agfa product it had a different colour signature to either Kodak or Fuji. Quite muted but probably the most neutral colour neg of all.
They had films made by Efke, Agfa, Filmotec and Ilford, their papers were made by Agfa, Foma and Ilford. Chemistry was made by Amaloco, Calbe, Fuji-Hunt and many others. The least common denominator of that hodgepodge is that it's all remnants from the bargain rack of the manufacturers. The only additional value are a new label, a fancy name and an excessive amount of impossible promises about the benefits. That might explain their extremely sort product cycles and numerous recall actions for faulty products.