I think you’re conflating hamburger menus with progressive disclosure: one is a subset of the other. Saying any progressive disclosure pattern is basically a hamburger menu is like saying all animals are basically fish. 🍔 🦒 🦔 🦓 🐟
No, truly, I’m not - yet fish are a common ancestor to all vertebrates, so sort of 🤔? Burgers dropped pre Windows 1.0 (props again Xerox) so in GUI nav terms they are primordial common ancestors & TBS v2 really reinforced the pattern. Will you share your ref to useability data?