End-to-end security does not require identical endpoints

I hesitated even in linking to this preposterous article. But its definition of ‘end-to-end’ encryption as requiring ‘identical endpoints’ is not one I’ve seen before (and my PhD title literally includes the phrase!) So two users of gpg and PGP aren’t exchanging E2EE messages? Any web browser talking to any web server over TLS isn’t getting E2EE? The Internet Engineering Task Force is wasting its time in developing and testing standards for interoperable E2EE communications?