It's a small industry and people talk. You can also infer more about the systems from the bits that are public and/or reasonable.

Unfortunately, information ages quickly. Stuff that Waymo published about their architecture only a few years ago is now wildly out of date.

That said, diversity is decreasing. Most players are standardizing on relatively similar hardware platforms using nvidia compute, with connectivity heavily focused around ethernet as opposed to older buses.

There's a lot of information about these systems out there. Waymo has has described in detail how their remote monitoring works. It doesn't rely on perfect connectivity. It doesn't rely on low latency. It can't even steer the vehicle remotely. It can tell the vehicle what it's next move should be. But all of the processing to get it to where the remote monitor thinks it should go is in the vehicle. It's details like this that distinguish between a demo and a product.

I make TikTok's about technology and project management. Elon's management style has been, some might say, a running gag in my videos, so I am more tuned into these topics than your average bear.