Thanks!
I'll investigate the wiki missing instructions for the RH1, but once you connect it to the app and start selecting tracks, you have a 'Download' button instead of the normal 'Record' one (so it looks as-if it had exploits enabled out of the box). The progress dialog box that comes up is also different to the exploit one.
The current version of Web Minidisc supports downloading tracks off of the MZ-RH1. That functionality has been added even before the exploits were a thing.