Do you have a source of this?
I was unable to notarize my software with my free Apple Developer ID account, so I paid $100 this year. This question (https://forums.developer.apple.com/thread/121113) seems to be answered "no". I would love to be mistaken so I can treat my family to a fancy meal tonight.
This service requires that the finished application be sent to Apple to be notarized as part of an automatic (and free) process, and that the returned "ticket" be "stapled" to the Mac app before distribution.
My subscription is about to run out in a few months, so I'll let it expire and test this, as it would save a bit of money, and a continuous Apple Developer membership isn't necessary in order to sign apps infrequently.