Sorry, but there's seriously flawed logic in that statement.
You have NO way to know how long fuel sat in a large storage tank at a fuel farm before it was pumped into the tanker truck which delivered that fuel to the place where you then pumped the fuel into your boat's tank.
You also do not know whether the fuel in question was pumped into the tanker truck from the bottom of that large storage tank, where more water tends to collect. I used to fuel aircraft professionally, and I am speaking from experience, having drained the sumps of fuel trucks more times than I could count. In the case of aviation fuel ethanol was not a factor, but simple condensation from humid air cooling to the condensation point served to cause significant contamination of fuel, such that draining sumps was done every day, and draining of any given sump was continued until the sample of fuel was free of water.
Honda approved the product in question for E10. That, coming from the people who built the product, holds a bit more weight with me than people trying to come up with ideas about what will damage the engine (not having an intimate familiarity with their particular product). This is a pretty modern product, not an antique.
See this link for the manufacturer's recommendation (page 99): https://cdn.powerequipment.honda.com/marine/pdf/manuals/31ZY0600.pdf
The fuel in storage tanks at the "fuel farm" shouldn't yet be oxygenated (have ethanol in it), and it isn't like fuel farms/depots are keeping years of inventory around. And busy stations sell loads of gas (for example, our local Kwik Trip sells a tanker of 87 E10 every day and receives a fresh one every night).
For me, I use E0 91 in our Evinrude outboard, but that goes long periods without being run (and is also a fifty year old engine). If it got run more, I'd run E10 in it and not lose any sleep over it.
As an aside, I really don't like using ethanol. If E10 wasn't subsidized such that it was cheaper than E0, I wouldn't ever use it, but the current pricing structure disincentivizes avoiding it (again, because of the subsidies it receives). I don't think that ethanol is a good product or anything, it's just quite expensive to avoid it (and not always necessary).