Certainly agree. The point is that coming up with the idea, writing it as an equation, or an architecture diagram in a paper, is a small fraction of the effort that goes into making the idea work in a model showing good performance on real life datasets.
For example, just taking a random paper that Schmidhuber claims should give him credit for GANs, https://people.idsia.ch/~juergen/FKI-126-90ocr.pdf hopefully you can easily see that a lot of work would be needed to turn this into a realistic image generation model. And that is, even if you admit that the idea is strongly related to GANs, which I'm not convinced of but won't spend time on.
> Credit belongs to whoever actually makes it work. >> That is according to whom? Is it a rule you just came up with or accepted practice? And if it's accepted practice, in what community is it accepted practice?
It is accepted practice in the ML community. If it weren't, Schmidhuber wouldn't be complaining.