I sort of assumed that Hacker News types would have already known that video on LaserDisc is analog. :)
Audio is somewhat more complicated; the original standards had that as analog too, but digital options were introduced (I'd like to say early 1980s, but not entirely sure).
The first digital audio laserdiscs I bought were in/around 1986. They used AC-3 encoding (later known as Dolby Digital 5.1) but were recorded as an RF signal onto the discs, because the format was analog. You needed a decoder to turn it into discrete channels, which a few receivers had. But most often you would get an external box, like the Yamaha DDP-1
Audio is somewhat more complicated; the original standards had that as analog too, but digital options were introduced (I'd like to say early 1980s, but not entirely sure).