Whether or not it's "okay" depends on you and where you're targeting your product. For example, many game jams don't allow content created with generative AI. If you're going to participate in a jam, you should check its rules to determine if it's acceptable.
On Itch, you must disclose whether your product uses this type of content, as some people don't want to buy or play content created with generative AI. I should also clarify that some people aren't interested in how the content is created; they're only interested in whether they like the final product.
To help you understand, it's similar to deciding whether to make a 2D or 3D game. Some people prefer one or the other, but it's not a right or wrong decision.
On the one hand, if you use it, some people won't touch your product for that reason. But on the other hand, if your game doesn't have good music, some people won't want to play it. So, whether or not to use AI-generated music is a decision you have to make.