That's a multiple master font, right? Support for that functionality has long been missing from ID (and Adobe no longer distributes MM fonts).
I realize that Adobe no longer supports MM, but they have instituted 'Opticals,' see: https://www.adobe.com/type/topics/opticalsize.html
That is, certain Adobe faces have four size variations, which I was lead to believe by Nigel French's book InDesign Type (p. 94) will function automatically as to size master when checking the box in Preferences.
Is this not up-to-date info? Is this a proposed function that was not instituted?
Nigel's book does say that, and I have that preference enabled, and I've never seen the optical size change automatically with a change in type size. I just tested with tree fonts that have optical weights to confirm.
I honestly don't have a clue what that setting really does, if anything.
Ah, alas, it's a will-o'-the-wisp! Nonetheless, this is just how digital type should be founded. But at least the potential's there within OpenType and within InDesign. Now we only need lobby Adobe and other founders to fulfill this promise.
Many thanks for your help, Peter.