I guess you are being deliberately awkward.
Even the articles you linked say the same thing.
Read back, I said TB3 can be used with USB-C (this is a connector, not a protocol) you then went on a multitude of false hoods about world hunger and penis sizes for pigmies (or something equally unrelated and irrelevant). TB3 "contains" the USB protocol (amongst others). Any rMB (or other device for that matter) with a USB-C connection can be plugged "directly" into ANY "TB3 device". You don't need any other ports, no magic cream, no secret masonic handshake. It just plugs-in and (this is the key word) TB3 will then automatically works over the most appropriate "protocol" based on what both devices support. So in the case of rMB the protocol that would be used by the USB-C connector will be USB3.1 G1, just like I've been saying since the start.
Where does it say in the video? It's what the video is all about. But heres a picture.
View attachment 711481
These are "some" of the protocols that make up TB3 - look at the end one. USB 3.1 it's part of TB3...!
From the article you linked.
View attachment 711487
One of the points of TB3 was to bring all the protocols together. The point of USB-C connector is that its universal connector for all things, not just a single purpose. USB-C does not contain anything, it's a connector type in the same way A and B are. TB3 uses the USB-C connector standard, TB3 contains the ability to use multiple protocols to talk to ANY device (omnidirectional) via the multiple protocols - including "USB 3.1". which in the case of the rMB is G1. There are no TB3 controllers in rMB, its USB 3.1 G1. There are no TB2 controllers in the rMB its USB 3.1 G1, there are no DP 1.2 controllers in the rMB.... i could go on.
I'll end this by quoting thunderbolt themselves. (while pointing out the rMB is G1 so we are crystal)
Thunderbolt 3 is a superset solution which includes USB 3.1 (10Gbps), and adds 40Gbps Thunderbolt and DisplayPort 1.2 from a single USB-C port. This enables any dock, display, or data device to connect to a Thunderbolt 3 port, fulfilling the promise of the USB-C connector. Now with a Thunderbolt 3 port, you can connect to any dock, device or display, including billions of USB devices.
Hopefully we've finally put this to bed now.
I'm fine with USB-A getting killed as long as Lightning gets killed at the same time, for the same reason as the post before mine.