I think my 2017 Willard 2 weighs around 22 pounds, give or take one pound.
The 18 boats will be similar. Small drivetrain variations, whether carbon or alloy fork. Tire size. Basic bike unchanged. You could easily lower the weight by putting some more upscale, lighter wheels and tires on the bike. Most budget bikes, i.e. bikes in the price range of the Willard's MSRP, have relatively heavy wheels/tires.