We're all only as good as the information and knowledge we glean across the years and sometimes what we're told is incorrect. Blue Book has a lot of errors, so does 'Beauty and the B', to name two common references. The Mother List is about as accurate as can be but there are still occasional suprises like that unknown Allen spinet. So did Yamaha really say PAS instead of PASS, for example! And they surely should have known what the A stood for.
I think 'digital' was the buzzword that many manufacturers were bandying around back then. I think we've both agreed a few times before that some were 'analogue under digital control' for want of a better description. Allen were digital back then, of course. But in terms of home organs Kawai were the first with 100% digital (except for the drums) tone generation and control in 1982 with the ADEPT based DX series.