I emailed Kurt Lang and he was kind enough to respond... Thanks for a very interesting post! And thanks for verifying that Kurt Lang is a real person. I thought he might just be some sort of Marvel Lord of the Fonts! I've been following his guidelines for years. Cheers! 
iMac (19,1, 3.1 GHz i5, 12.7.4, 40 Gb RAM); MacBook Air (1.8 Ghz, 8 Gb RAM, 10.14.6, 256 Gb SSD) Vodafone router and Devolo Wi-Fi Extender, Canon TS8351 printer/scanner.
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