The doc you quoted is for BIOS systems, your Window partition is UEFI, so of no relevance here.
You cannot install UEFI without a seperate /boot, see the install guide, see the explanation during the install for an UEFI EFI partition.
If you mean, you need a second EFI partition, that is depending on your Windows setting, and if you want to keep updating your Windows install, then yes, create a second EFI partition, Windows is notorious for overwriting an EFI /boot partition on updates and removing all entries but Windows. None of that is KaOS specific though, all you are asking about is Windows.....