This has not been true since 2015, when the various developer programs (Mac, iOS, and Safari) were combined into a single Apple Developer program (for $99/year).
Source: I've been a member of the Apple Developer program since at least 2006, which was the first year I attended WWDC. The current program is described at <https://developer.apple.com/programs/>.
Source: I've been a member of the Apple Developer program since at least 2006, which was the first year I attended WWDC. The current program is described at <https://developer.apple.com/programs/>.