The EPI report is one of the commonly cited baseless reports. Dig in a level beyond their press claims and you’ll find no real method behind it that justifies their claims, because they have no actual way to compare one worker to another to know they’re equivalent and comparable for the purpose of compensation.

As for your claims about Apple - I am guessing you aren’t a manager and don’t know about how their pay scale works. I’m not doubting your claims about the quality of some workers - although I bet you’ll find plenty of non immigrant people not doing work as well. But I know the claim on pay is wrong, once you adjust for performance ratings and levels.