Comment by ActorNightly

.... I literally gave you a way to check this yourself. Not sure why you would need a 3d party source to find something you can discover yourself.

Also keep in mind that https://www.obdev.at/blog/a-hole-in-the-wall/ and its subsequent patch https://support.apple.com/en-us/102445 refers to things that bypass the firewall. There are things on your Mac that simply won't function if you block them from phoning home, making your OS an unusable mess.