I just recently asked that question:
Here is the answer in my own words:
If you are a Canadian Non-Resident you can NOT use netfile.
So now you have 3 options I believe:
1) mail it in from where you are
2) Fax it in (yes they are still taking faxes for 2022 taxes but maybe not next year)
(and i have the link with numbers somewhere if somebody asks)
3) Fill it out your taxes, with the deemed forms, email to a "really" good friend in Canada, have them print it and mail it for you.
