Well the fix is not just the turn down tips, it also included replacing seals and other checks.
More importantly be logical about this. If this was strictly an exhaust tip issue, do you really think we would only see this on the Explorer? How many Ford SUVs exhaust exactly like this, out the rear? Also note, there is info stating the fix (turn down tips) is not actually fixing the problem in some cases. There have been issues of actual exhaust system joints leaking, no where near the tip.
Annnd the recall affected units was supposed to be 2011-2017 models, although they have had some complaints from 2018 owners that have yet to be substantiated. I mean we can be conspiracy theorist all we want. But if the infiltration problem was ONLY related to whether a exhaust tip pointed down under the vehicle vs. out the rear, how do you explain idling, sitting still not being a problem? The exhaust is going to shoot down and given its lighter then air and the vehicle is not moving... it's going to infiltrate into the cabin... again if the tip was the root of evil here.
Just asking folks to use some logic on this turn down tip thing, the cabin infiltration problem while maybe being helped by a turned down tip, has absolutely got to be more about design of sealed openings and possibly other joints in the exhaust system or again this problem would be present on WAY more vehicles Ford produces.
So much for my thinking it may have had to do with the "exhaust smell" issue. I stand corrected if this article is true. 
