Yeah, I noticed that too (been homebrewing off and on for a lot of years). Nothing wrong with the recipe, of course. I tend to go the extract-and-specialty grain route myself. But this is a pretty basic brew concoction considering all the hub-bub that’s been ginned up around it. I’ve done as good, or better in my own carboys. You’d think they’d a least have used a liquid specialty yeast for something a little more distinctive.
It would not be too hard to isolate a strain of natural yeast near the white house and do some experiments. They could try a yeast from the garden area and if it made good beer it could really be distinctive.