Yes it may be entirely based upon AI buzz, but there should be no reason that Apple also couldn't have inflated stock due to AI buzz.

For example, I have questioned why Nvidia has been able to be the unchallenged leader in AI graphics cards.

With Apple's silicon knowledge, access to leading edge TSMC fabs and volume purchasing power (due to selling millions of devices) – Apple could and perhaps should be selling unique processors to AI companies, and also using them themselves – taking a huge amount of revenue and mindshare from Nvidia.