First there was Darwinism, then the eclipse of Darwin because of Mendel, then noe-Darwinism also called the modern synthesis. Then came Haldane’s dilemma and Kimura’s solution with neutral theory, which effectively ended neo-Darwinism in the late 1960s. Every contributed to an extended synthesis and a few odd balls decided to pick a fight about capitalizing those words into an Extended Synthesis, but there doesn’t seem to be much substantive in that capitalization change.
That’s about how I understand it.
Seems that’s a point we’ve made several times over. See for example: Retire Darwin Day?
Somehow ID really wants to call us Darwinists still. I asked Behe about it once… Behe and Swamidass: Texas A&M on Feb 20, 2020 . I don’t think he got my point…