Yes indeed it does!
I had a thought ( always dangerous ! ) looking at that website ....what if ....
You take two engines like the ones shown , complete with ride on mower transmissions , ( you now have reverse to each engine )
and mount them side wheeler fashion ....one per side / wheel ....you could then steer using reverse....
Seems like that could be a way to power a modest size river cruiser for two.
Even if the engines only last a year or two , they are not expensive , or difficult to replace .