GREAT NEWS! Mr Anderson is back from retirement with his (Stretch) Pattern School 2.0!
I haven’t explored it in details yet (pandemic panic & all), but he says the info has been updated to reflect latest developments in swim / dancewear fabric technology & patternmaking approaches. Unfortunately the free auto-generated custom block feature is gone because the company that host the new website doesn’t offer such sophisticated programming options. But there is now a Pattern & Block Shop for RTW designers & interested home-sewers. Presumably this will be standardised sizing rather than custom based on your measurements, but certainly better than nothing!