Understood. Thank you. Unfortunately, Textures.com doesn't allow the textures to be included in the model and shared under the terms of an open source license (such as CC0). From Textures.com license FAQ: https://www.textures.com/support/faq-license#games

"Please note that it is not allowed to release our images under Open Source licenses (even when the materials are modified). If you are working on an game that is released under an Open Source license, you need to release content that has been created using our materials under a closed source license."

Would you be willing to remove or replace the textures embedded in your models with openly licensed textures? Until then, I have to flag them as having licensing issues. 

Please always credit textures when submitting 3D models in accordance with the site submission guidelines.

EDIT: Fixed, thanks! :)