Answer is misleading. Not being able to setup alternative to example is completely different than "not possible". The need to spend some time to make it work is different than not being able to make it work.

this is duplicate of the same issue https://github.com/decaporg/decap-website/issues/79#issuecomment-2388497883 but with wrong conclusions (personal conclusions presented as objective). You can see in issue that other users have successfully set up authentication without netlify