https://www.wildflower.org/plants/result.php?id_plant=hema2

This link is to the actual Maximilian sunflower, which I couldn't find on the link you provided. They don't talk about the tubers, but it does give a decent description, if not point by point means of identification.

I do have sunchokes, currently in a large pot, but I'll be planting out the tubers in the next few days. Hopefully they'll do well here.

I'd like to have Maximilians in our barnyard, and in a few clearings In our woods, as they are such an amazing nectar source for pollinators.

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