Doug, yes I read it and I now understand the RAW file is not overwritten, thank goodness. "processing the RAW file creates a DNG file" is not correct; you can create a DNG file, but you can also use other formats like PSD, TIFF, jpeg, etc. And furthermore, the metadata is not necessarily packed in the DNG file, only if you choose the sidecar setting AND the DNG file is not Read-only. And, you can choose the sidecar route and then the metadata is saved in the xmp file, unless you work with a DNG file that is not Read-only.
I think Adobe could do a way better job of creating a user manual for Elements; in order to learn what all the different settings and buttons do in ACR for instance, you have to really hunt for this information in different sections of the manual and often you need to click on links to the Photoshop proper manual which often doesn't apply word-for-word to Elements.