AI-generated art cannot be copyrighted, rules a US Federal Judge::United States District Court Judge Beryl A. Howell found that AI-generated artwork can’t be copyrighted, putting to rest a lawsuit against the US Copyright Office over its refusal to copyright an AI-generated image.
If the textures are not copyrightable then they are in the public domain are they not? If so the same rules apply to any public domain works and I believe you can use them however you want to in your own works.