Okay, I didn't know that. I've only seen very low-cost HP branded Win10S machines and they were all Pro.
If these machines are from before the April 2018 update, once they updated they would be come Windows 10 Pro in S Mode.
Going forward I think pretty much every machine you will see with it will be Windows 10 Home in S Mode. You can upgrade the 10 Home S Mode to Pro S Mode.