I interpret the "by default" as meaning the exact same thing as "Developer ID is required by default for Mac apps" today. Or in other words, I would assume that

I interpret the "by default" as meaning the exact same thing as "Developer ID is required by default for Mac apps" today. Or in other words, I would assume that getting around a non-notarized app in the future would have the exact same sequence of steps as getting around a non-Developer ID-signed app today.