You guys are a hoot. The IIHS tests are junk? Oh TEH Noes!!! Someone disparaged the Explorer, we can't have that...
I didn't see any IIHS article that said the Explorer was now a death trap. Here's the article on the IIHS website.
Passenger-side tests of midsize SUVs reveal flaws
Basically says their new test reveals some major flaws and rates the explorer as poor on the passenger offset test that was just conducted. The passenger side test isn't exactly a new test that was just invented either. It's the same as the driver side test that has been around since 2012, just done on the passenger side...
Here's all the ratings by year.
2013 IIHS TOP SAFETY PICKs
As you can see, vehicles are rated each year with the tests/data available at the time. It's the same thing CR does. They may rate something one way and change it later as more info comes to light (re: tesla). In 2013, both the Explorer and Grand Cherokee were TSP because they met the rating criteria at the time.
Just a note - there is no need to redesign a vehicle to alter it's crash ratings. Ford F150 crew cabs had an additional brace/bracker/whatever that the extended cabs did not have, which apparently allowed the crew cab to rate higher on passenger crash tests. "The Ford Explorer was redesigned for the 2011 model year. Beginning with 2013 models, the seat belts and airbags were modified "(presumably to improve safety/crash ratings). The new Explorer has been in production since 2011 - that's 8 years that Ford had to consider additional minor changes perhaps to the seat/seat belt/airbag/etc... or the addition of a brace/bracket/whatever to improve passenger side crash ratings (and possibly increase the driver side rating from marginal to at least acceptable).