That is true. The Nano is $99, where the Xavier is $399. That changes the game for some use cases. I suspect the Xavier still won't see as much press because of that, though it doesn't change much of the core message -- GPU based compute at the edge.

I'm the author: The board was indeed first released last year, but earlier in 2020 they re-released it with a significant carrier board upgrade, and the amount of supporting documentation and tutorials has also increased, which can be just as important.

This looks to be great value for the money - even has GPIO pins!