First and foremost: beautiful and performant website.
I don't understand how exactly the Volument product actually performs A/B testing (or distinguishes between different variants). The only code docs [0] I've found are very, very light on details and doesn't mention how the active variant is detected. To be fair, the product hasn't launched yet so perhaps the docs are currently internal-only.
That being said, very interesting idea of linking engagement to eventual conversion to get "results" faster. It certainly seems reasonable that there is a causation relationship (increased engagement, e.g. more scrolling and longer visit duration, eventually leading to increased conversion), but I don't know how statistically valid that is.