From the Enforcement Hiatus document linked above, emphasis mine:
This policy applies only to holders of an FAA-issued medical certificate serving as a required pilot flight crewmember or flight engineer within the United States. It does not apply to holders of an FAA-issued medical certificate serving as a required pilot flight crewmember or flight engineer outside the United States.
Here is some guidance for international ops from FAA.gov:
FAA Announces Additional Pilot Medical Certificate Exemptions
The FAA is granting an exemption that extends until June 30, 2020, the duration of medical certificates for certain pilots and flight engineers who conduct
scheduled and
on-demand operations outside the United States if those medical certificates expire between March 31, 2020, and May 31, 2020.
COVID-19 is placing a severe burden on the U.S. healthcare system. Requiring pilots to undergo in-person medical examinations would further stress the healthcare system, and would increase the risk of transmitting the virus through personal contact between the doctor and the applicant. The FAA last week issued a policy stating it
will not take enforcement action (PDF) against certain pilots or flight engineers who fly domestically with medical certificates that expire between March 31, 2020 and June 30, 2020.
https://www.faa.gov/news/updates/?newsId=94991
Apparently there is some other document floating around that says the operator must file a Letter of Intent with the FAA to authorize the medical exemption for operations outside the U.S. Anybody have it?