That's a weird take given the actual numbers and relative results per company, but ok.
Microsoft's price didn't change much at all and is still trading at a 35 P/E ratio (17% higher than Apple's) despite being neck and neck in the race for the largest company in the market and allegedly not having its AI efforts actually change product usage. Clearly the market is still pricing it as if it's going to grow more somehow.
AMD is down, but since when is AMD an "AI company"? That's Nvidia through and through, who is still double digit percentage points up from a month ago, and trading at a 81 P/E ratio. The market losing faith in Nvidia's competition seems more like the opposite of this headline, given it's the key area where Nvidia has a market advantage over AMD.
Google, whose revenue is 90% ads, is down in response to falling short on ad sales. Which if anything may be a result of increased chatbot usage reducing search volume and Google's chat offering being the Bing of AI chatbots.
Microsoft's performance was actually strongest in their Azure services in their earnings report, and I can't think of any AI products tied directly to that part of their business
Although to be fair, their big push now is baking copilot directly into Windows 12, so it would be fair to think their long term outlook is tied to that service