Certainly not heirlooms. Also those varieties are bred by them. Carolyn must be confusing it with something.
But a lot of F1s on the market, especially the cheaper ones, have very close offsprings. Like Big Beef for example. Maybe they just have very close parents, for bigger tomatoes you need both parents to be big. It's hard to say if it's a real F1 or not, without growing a good amount of plants and be able to find small differences.
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