Sierra Nevada responded to my question. The response was quick, considerate, generous, and a little weird.
Basically, they said two things that didn't seem to jibe. First, they confirmed that the beer was too old. Second, they said it was past the 150-day mark. The beer was packaged 91 days ago.
I am quite sure they package their ales as soon as they're ready to drink. Surely the 150-day period is counted from the packing date.
They are sending me a check of some kind, good for a 12-pack. That's really nice of them. Great customer relations. I was perfectly happy to find ways to use the beer and then continue buying other Sierra Nevada products. I took a chance when I bought it, so I figured that was on me, not them. I flat-out told them it looked like they were making a mistake, but I gave them my address because I have a feeling they'll mail the check anyway.
My plan is to try to use the check to get the other Sierra Nevada hazy I found locally. I hope I like it, because I plan to review it.
Sierra Nevada makes a lot of great beer. The fact that one guy was not overly excited about one ale doesn't mean anything.