I respectfully disagree. The text of the law is rather easy to read: The end-user has the right to "receive the personal data concerning him or her, which he or she has provided to a controller, in a structured, commonly used and machine-readable format." This imposes exactly zero burden to support any "remote platforms" so let's ignore your red herring.
I am expecting to find something identical to Google Takeout, Facebook Takeout, Amazon Takeout, where I click on a link and I am provided with a .zip file containing *all* my data.
I understand from the lack of clear answers here that such a feature is still missing in Evernote for end-users, in contradiction with Evernote's official commitment to data portability.
I will pursue the "contact support" approach that you suggest.
Thanks for your interest.