If you read, the DTD rep never said "BFG didn't make that size tire". Using the term/word "odd" implies/indicates a meaning of, not as common as some other sizes, not that the size is not made. After using the term 'odd' he said it could take a couple or few weeks to get it back in stock. What DT stores have in stock would be/is determined on an in store basis of availabilty, or the ability to swap between stores, which is common practice. As an online company, DTD would not be the same ability, similar to Tire Rack not having that size available till next month.
As for Treadepot, they are the online subsidiary of Kauffman Tire out of Atlanta. While Treadepot may or may not have the tire back in stock on Wednesday, they currently don't have it in stock. However, similar to DT some of the KT stores in/around Atlanta have that size in stock, while other don't.
So, while the size may or may not be an "odd" size, the fact reamains, 3 of the largest online tire companies including DTD, don't have 235/70/R16's BFG Long Trails currently in stock.