Exactly. The OW does warn you about your speed, going past 15 mph is a decision you make and risk you take. Motor only has so much power, so it can balance you or accelerate you; the faster you go the less it can balance. There’s a few riders who stay below pushback and haven’t nosedived in 4000 miles.
If your light weight or skilled or both you have a better chance being able to push past 15 mph.