This would be my guess too, except that people are saying they haven't seen this extreme of an absence of acorns before. If this is an adaptation against acorn

This would be my guess too, except that people are saying they haven't seen this extreme of an absence of acorns before. If this is an adaptation against acorn eaters, why is it so rare? Also, squirrels don't just eat acorns. They also bury them and forget to dig them up, thus helping to produce more trees.