The file is only 7.7kb, so it couldn't contain many weights anyways.
Exactly. Put another way, tensorflow is not an AI. You can build an AI in tensorflow. You can also resize images in tensorflow (using the traditional algorithms, not AI). I am not an expert, but as I understand, it is common for vision models to require a fixed resolution input, and it is common for that resolution to be quite low due to resource constraints.
Probably not what your alluding to but AI upscaling of images is definitely a thing