I'm pretty sure that my '19 has the problem as well. It was manufactured 02/19 so likely doesn't have the revised part. There is a very noticeable/distinct rattle on cold starts--almost sounds like something rattling against a metal heat shield or something, and then it goes away after five seconds or so.
However, when I watch the videos that others have posted, I'm not hearing the same noise as on my truck--the videos sound much more subtle. Is that maybe just an anomaly of the videos and the problem is more easily noticed in person?
Also, I'm at 41k miles, so would I still be covered under the powertrain warranty if there's a TSB on the issue and my truck is proven to have the problem?