Mr Henri, they definitely look antho to me too, with the blue black concentrating at the stem end. They perhaps have some heirloom genes in their make up, but the blue/antho trait is an artificial "recent" lab creation, so this tomato itself should not be called an heirloom at this point. Some people may call any open pollinated or non-hybrid tomato an heirloom, and I suspect that is what the website is doing.
Definitely grow out the seeds and let us know what you get! I'm not thrilled with most antho tomatoes either, but I'm growing Lucid Gem again this year, it's not too bad!
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Dee
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