I can't find it on the HR page, and Google searches aren't turning up much that is useful. It's still pictured in a few of the HR-BUD photos and a PDF of the manual is still online, but that's about it. I did some preliminary searches on head-fi, but I can barely navigate that site these days.
If it's in fact gone, it seems like an odd move to me. The "build your own Max" option of buying a HR-BUD, HR-UDAC and DPS is no longer possible. Not to mention the lack of a top of the line source for the HR power amps + Harbeths. Where's Tyll when you need him?*
*Yes, I realize he's no longer directly affiliated with the company.