According to the most recent list from the EU here,
Third countries whose residents should not be affected by temporary external borders restriction on non-essential travel into the EU includes Japan.
I am American, which is DEFINITELY not on the list, but I live in Japan with a spouse visa, and thus could be considered a resident of Japan. I have not traveled to the US since November of 2019.
Do you think I would be allowed in? For context, I'm thinking of flying into either Germany or Portugal (haven't decided yet).
UPDATE: I have reached out to the German border police (at firstname.lastname@example.org) for more information, and they replied (within 6 hours!) with this:
thank you for your question. You can currently only enter Germany with a valid reason. It is intended that travelers from Japan be exempt from these restrictions. However, this only applies when EU citizens in Japan are no longer subject to restrictions.
It seems that since Japan currently doesn't accept German travelers unconditionally, the opposite still does not apply.