Looks like I’m not the only one seeing it though based on emails. But it’s not a universal issue, so not sure what the deal is.
If you go to a Play page and see that you don’t have any devices on Google Play, just click the install button, you’ll see your devices. There doesn’t seem to be a workaround or a fix yet, but I’ll update this if there’s anything you can do.
For now though, treat it as a fake warning message, click install, and be treated to your devices which are fine and intact on Google Play.
Above: see, they’re all there.