Was dot com a bubble? If you could transport yourself to the late 90s, would you try to convince people that the internet's impact on the economy would be no greater than that of the fax machine by 2005. Or was it just some companies were overvalued?
That's what a bubble is.
Calling AI a "bubble" is not calling it useless or a fad. It's just pointing out that companies in the sector are overvalued. And it's important to recognize and correct bubbles quickly because the bigger the pop, the worse the overall economic damage to everyone.