They likely thought removing an out of date scripting language after more than 10 years was a minor change.Their nomenclature seems to be major, minor, patch.
(macOS 10.x is arguably a special case. Technically, 10.1 Puma, …, 10.5 Leopard, …, 10.10 Yosemite, etc. were "minor", but that clearly wasn't the intended message.
But, with macOS 12.x, 12.0 is the major release. 12.1, 12.2 and 12.3 are clearly minor.)