First, you have no proof he doesn't have a desert female that does produce.
Second, you can't say "buyer beware" unless you state something to "beware" of. There's no name to "beware of buyer" and there's varying opinions on the deserts still, even if overwhelming votes tend to go to "females are sterile".
Third, if you start calling someone a liar, you can't expect for the deal to go well. Stating that the guy was lying because you don't think a desert female can produce is a guarantee for him to get mad. I would have. If you are 100% convinced it can't happen, then don't mention it and just deal for the ones you do think are good. If you think the guy is scamming, just bow out and tell him you don't want to deal.
Just saying... calling some a liar with no proof is a great way to burn bridges. The attitude tends to follow people. He could be one of the only people with a producing desert... he could have been referring to a desert ghost... no telling.
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