No it isn't.
You can always check what products are part of a bundle. You can check if the products are AI-gen for any of these products.
Unless the bundle actively tries to deceive you into believing that no part of it is AI-generated, this is not fraud. Fraud requires intent to deceive in any legislation I am aware of. Making information available, but making it less obvious than you personally want it to be, is not fraud. That is a failure on your part to look at what you are buying.
Containing multiple recolored versions of the same sprite is also extremely common for tilesets, including high-quality ones like those of GuttyKreum or limezu. It will be very hard to argue that this constitutes fraud.