Upon second look, it would seem that the spirit of what they mean by "the Apple Software" is 'the whole set of standard Apple software (that comes pre-installed on the Apple machine'.
But actually, even more strongly in favour of interpreting that they don't specifically license macOS for use on a Linux host via their agreement, is the syntax of 2.B.iii itself (italicisation for emphasis):
> [you are granted a license] to install, use and run up to two (2) additional copies or instances of the Apple Software within virtual operating system environments on each Mac Computer you own or control that is already running the Apple Software"
Their clear syntax of repeating "the Apple Software" in the context of both guest and host environment indicates that what is used virtually must also be used on the host.
Additionally, you probably couldn't get out of it by dual booting with Linux and saying that 'aha, see, I have mac running on the host machine I'm fine', the grammar of the words "that is already running" indicates that macOS must be running while using macOS as a guest, under their license.
I can't imagine any serious legal implications that really matter apart from to major corporation making major money off virtualising macOS somehow. To anyone else or any other angle relating to it, I don't think there's any worry whatsoever. It appears the Hackintosh community hasn't been sued into oblivion...
But actually, even more strongly in favour of interpreting that they don't specifically license macOS for use on a Linux host via their agreement, is the syntax of 2.B.iii itself (italicisation for emphasis):
> [you are granted a license] to install, use and run up to two (2) additional copies or instances of the Apple Software within virtual operating system environments on each Mac Computer you own or control that is already running the Apple Software"
Their clear syntax of repeating "the Apple Software" in the context of both guest and host environment indicates that what is used virtually must also be used on the host.
Additionally, you probably couldn't get out of it by dual booting with Linux and saying that 'aha, see, I have mac running on the host machine I'm fine', the grammar of the words "that is already running" indicates that macOS must be running while using macOS as a guest, under their license.
I can't imagine any serious legal implications that really matter apart from to major corporation making major money off virtualising macOS somehow. To anyone else or any other angle relating to it, I don't think there's any worry whatsoever. It appears the Hackintosh community hasn't been sued into oblivion...