Just trying to figure out if this is...
a) An ironic put-on of some kind
b) Maybe they're a company that continues to service this equipment for a customer base of aged moguls that had this installed in their grand estates 40 years ago, so they decided to get a web-presence (after finding someone to translate their Hypercard deck to a website).
b) They're playing it straight and trying to show that this stuff is a "long-term" solution-- with the argument that if this stuff is still running after being installed 40 years ago that, of course, it will be running 40 years from now?
On the other hand looking at the fragmented state of home automation right now, one has to wonder if there's a profound lack of vision that was lost in the last 30+ years. Perhaps it just goes to show that a well-thought out system design can last a long time almost regardless of what technology was chosen.
The home automation market right now looks like a sketchy hot mess of surveillance capitalism and blatant rent-seeking. If you want something that actually respects you and your household without ulterior motivations and you can't "roll your own" maybe something like this is the ticket for you?