I don't see it. . .but he could still have Pyr in there. I've known many mixes who have breeds in them you never would have imagined!
Of course shelter labels are often BS, too. When I adopted Fable they bent over backwards enough to convince me she was actually a purebred GSD, even talking about the story of the person who relinquished her. She's grown up to be like 20-25 lbs, so. . .
I've seen dogs at the shelter being labeled as purebred when they're not, and also being labeled as really rare breeds/mixes when there's a ridiculously small chance they actually are. It gets people interested in adopting.
Yes, that would be me being absolutely no help at all.