Note that water tiles have cost 2, so the tile-crossing limit cannot be expressed simply as a maximum total cost.

Looking at the two examples in the paragraph after "And there’s a lot of complication to it beyond the simple cases too", I can't figure out how the movement value is defined, as I can only see 10 and 8 moves respectively, not the 14 and 10 movement value claimed in the following text (and only one water tile on each path.)