By the way, I came across this,https://www.suos-hifi.com/#
A simple scroll down to the CD- Boards section answers all my questions (chicken/egg) and shows the CD-84 to be an improvement over the CD-80. There’s also a CD-88 and CD-100.
There is no mention of what slot loader is used (the others are metal and plastic trays). Hopefully the slot drive is something new they’ve been working on or at least an improvement over what they’ve been using on the DS2 series.
All the best,
Nonoise