It does interface with blender. However, Garmen can't call their watches "Apple Watches" just because they can interface with Apple products. And they certainly can't claim Apple Watch as their registered trademark like OP ("BlenderGPT®").
They aren’t software, Blender foundation likely has exclusive use in that domain. I’m guessing if it was litigated it would come up, but that they’d prevail.
And this is not even just about software in a general sense, it's literally software that creates the same product: 3d models. Absolutely asking for trouble.
The fact that the trademark doesn't merely describe the product is what allows for protection. That's why Apple can be trademarked for a computer product but not for a fruit, as the latter would be merely a description of the product.