I'm not entirely sure what this '85 IP info comes from but I think from Zombie's research, the last IP for home video was made in '85.
Yeah, I'm also curious and I find it interesting, so far I have only discovered that the JSC was indeed from the same IP that was used for the '82 LD, don't own the '85 LD and '82 tapes, would be interesting to know if they are from the same source.
Edit: just an observation, the 1996 TV SciFi Broadcast seems identical to SWE (technidisc) going by those pics on your page, none. The '93 SciFi Broadcast, '94 VHS Effy11 and probably Moth3r's french LD preservation are from the same "early generation IP".