The rating is not tied to the 2.0L, it is tied to the OEM tow package.
The tow rating for my '14 Escape is 3,500 lbs. with the original 2.0L and the OEM tow package, I have thousands of miles towing the boat with that vehicle, no issues.
The '17 Edge with the tow package is also 3,500 lbs., what I am trying to figure out, and can't seem to get an answer to is: What, exactly, is the tow package, and can it it be retrofitted to the Edge.
If someone had a parts list if there is anything beyond the hitch, wiring and cutting the bumper, that'd be great.