Intel are finally starting to license motherboards on Ryzen (Asrock had one certified in Febuary) so it's not impossible,

The new Thinkpad T14 is supposed to have a TB3 on both the Intel and AMD versions, at least.

That has not been confirmed. There is nothing official on the T14 on the Lenovo site yet except from the press release.

https://www.lenovo.com/us/en/commercial-notebook/thinkpad/th... (and yes that's the right url, try replacing "thinkpad-t14-series" with "x" you will be redirected there)

I'm going off of the datasheet reproduced here:

https://www.notebookcheck.net/Lenovo-ThinkPad-T14-Ryzen-4000...

everybody does that and it's getting really boring fixing this. When the PSREF is out then we can talk until then, that's just a heap of typos. They already published a correction over RJ45 and blablabla i need to type this up four times a week on various social media, people, get a grip, there is ONE certified AMD motherboard with TB3, an extremely expensive Threadripper it is beyond unlikely that it will happen

It's possible, but less likely until USB4 (iirc) where TB becomes an optional part of the spec, without the need for certification from Intel... Probably next year we'll see a lot more options in the space.