I believe invention of Transformers and especially Attention mechanism do have influence from past research but its not definitely only the Schmidhuber's work. Said that, if we remove the papers mentioned by Schmidhuber from history, I am quite certain that there will be no influence in the discovery of Transformers, hence his works can not be the root. He has to grow up and accept that work and equations can appear similar, looking at inverse squared law and saying Newton stole that from someone is being dishonest.