What is he even arguing here? That he has been cheated out of some kind of credit? Credit for what? Afaict he has never actually shown something novel based on his ideas to work in a way that has mattered.
He's (at least to some extent) arguing that if you're going to say someone's paper is "mostly wrong", saying the same things 4 years later should probably warrant a "ok, you were right" at least.
Ie. the whole "idea" being "hey, for gai we need something different than this gtp3" tweet, not "idea" as in "hey I invented this new thing I call LSTM, check it out [link to paper, results what not]".
Well, the LSTM fella does pop up later calling out Lecun for "rehashes but doesn't cite essential work of 1999-2015". Which I guess does mean people with real "ideas" are also fed up with him?
"Deep learning pioneer Jürgen Schmidhuber, author of the commercially ubiquitous LSTM neural network, arguably has even more right to be pissed [...]"