The use-ntp host parameter when set to false still tries to use ntp because of the default os check. os_major is <=7 which will always match for el7
https://github.com/theforeman/community-templates/blob/develop/provisioning_templates/provision/kickstart_default.erb#L46

  use_ntp = host_param_true?('use-ntp') || (is_fedora && os_major < 16) || (rhel_compatible && os_major <= 7)