Actually the chemistry doesn't seem very hard at all.
Reactions with Water
Usually, reactions of chlorine with water are for disinfection purposes. Chlorine is only slightly soluble in water, with its maximum solubility occurring at 49° F. After that, its solubility decreases until 212° F. At temperatures below that range, it forms crystalline hydrates (usually Cl2Cl2) and becomes insoluble. Between that range, it usually forms hypochlorous acid (HOClHOCl). This is the primary reaction used for water/wastewater disinfection and bleaching.
They did state "usually forms " which is just like how you said likely forms.
Meaning you put chlorine into water , better chance than not, hypoclorous acid forms. If it didn't, your statement and the statement of that study would read "sometimes hupocholorous acid will form" or "there's a small chance the acid forms" or "if you're very lucky and all conditions are ideal, maybe you'll get hypochlorous acid"
For cleaning a cloner, pool shock at 3 pennies a gallon to "most likely get hypochlorous acid" is a way better option than "chlorine water named UC roots for $80 a gallon"
It's cloning. Simplest thing in the world. People stick cuts into cups of tap water and get roots.
I'll still run a side by side test with these but I'm pretty sure I wasted money on a snake oil product. I was intrigued because I like to be environmentally cautious where I can but I doubt these are game changing.