That’s part of the story, but in addition the link I posted says the OS will report different numbers depending on which SDK version you have linked to.
apples
10.16/11.0 seems to be their version to fix up the OS X = 10 forever and always screw ups without breaking everyones bad assumption that the minor IS the version
Anyone who JUST read the minor and decided that 14, 15 meant it was some specific version and ignored the leading Major number is the ones who will get clobbered for their bad choice
Apples trying to gently fix that I guess
And for that I give them some credit, because they normally don’t seem to care what developers think or backward compatibility – even if it was stupidity on the part of the developer assumptions. Yet they went out of their way on this one, even before the first beta. Very un-Apple of them.