Last try. I 100% understand that USB-C is a standard (not proprietary).
However, the question asked was the ability to both power up the new Macbook while also feeding some data (via HDMI) to the guy's TV. What I saw today was 4 kinds of connectors in one hole, not 1 kind of standardized connector in one hole. That one hole perfectly fits a USB-C cable but is there more in there to allow something like charging and sending video work at the same time?
Somehow you keep reading me saying something like USB-C is not a standard or Apple has made it proprietary. I'm not saying either. What I am saying- which is speculation- is this: is the functionality beyond USB-C in that same hole implemented in a way that a special proprietary and/or expensive adapter would be needed? And that appears to be answered here:
https://www.macrumors.com/2015/03/09/usb-c-digital-av-multiport/
So, again, I fully trust that USB-C is a STANDARD. I speculate there's more to that hole than implied and that that "more" requires a special adaptor in answer to the guys question (which appears confirmed at the link).