The latter two are well known. It is the DV Direct I’m unsure about. Is there a chance it could mean it could play full BDMV DV rips like the CXUHD or Oppo? I’m clueless on that, but I’m sure someone will pony up the money and tell us soon.
I'm sure it's just the same as the Zidoo - I'd assume "DV Direct" just means Standard DV (8-bit RGB HDMI Tunneled) and LLDV is, well, just LLDV.
VS10 is the name given by Dolby to a project from 2015/16 to create a Dolby processing engine for standard media SOCs - initially taken up by Realtek and Mediatek. So all Dolby processing, whether Standard DV, LLDV or conversions using the Dolby algo are done through the VS10 engine - the idea of it is that all media, whether DV, HDR10 or SDR will be output in the best available format available at the display, whether DV, HDR10 or SDR (in reality it's not quite that simple, but I'm sure there will be discussions here soon over that.....)
Not sure how HLG fits into it, but you can certainly process HLG as DV with VS10 but VS10 may treat HLG first as SDR (since it's compatible).