I dont know... I see the video, but everyone of those videos shows a half front collision... the strength of the older cars is in the steel and a straight on head 2 head collision or side swipe..
with weight and speed on its side, I dont get how you get over physics... "an object in motion, tends to stay in motion til and equal and opposite force acts upon it" and a lighter, softer car may have a crumple zone to help the fender and push the impact around the cab (which is how all these new cars work) but the fact of the matter is that weight and steel win... over light and plastic in the end.
I have seen accidents with my own eyes that prove this point... (sorry I didnt have a video camera ready while I was driving!) I am searching though and will get back to you on this...
I dont see how its possible that the 4th gen is "stronger" "safer"?? possibly... but only because of crumple zones etc, not because its built better... again, time will tell.
in 14 years we will see if the percentage of 2010 models on the rode match the percentage of 96 4runners still on the road.
A few points for you to consider:
1. An offset frontal collision tests body structure strength MORE than a full frontal collision. You got it backwards! So, yes, the data result from the video shows you that body strength is superior in the modern vehicle.
2. If you want to compare full frontal crashworthiness, then just look at NHTSA data...they test full frontal collision to test restraint system. In other words, IIHS test protocol tests structural strength, while NHTSA tests restraint system. Either way, the newer 4runners are far superior.
3. You mentioned weight and physics...excellent. Of course, the 4th and 5th gen 4runners weigh MORE than the 3rd gen...so, there goes that argument by you!

Frames in the 4th and 5th gen are significantly bigger AND thicker!!
4. You want to see a truck with metal bumpers in a crash test? Look up prior generation Ford F150 or Chevy Silverado...and compare that with the Tundra. BIG DIFFERENCE!!
5. Remember, the frame is still steel. The hood and fenders are still steel. If you base your whole argument on steel bumpers, then you are really not basing it on any facts.
6. Lastly, lighter does not always mean less steel. Remember, modern cars use high-tensile steel which is much lighter than conventional steel yet much stronger. In fact, in the Toyota press, the 5th gen's frame is reinforced by high-tensile steel. So, the 4th and 5th gen frame may be similar in weight, but the 5th gen frame is likely stronger.
About the ONLY thing that i feel is better in the 3rd gen (besides it being narrow for off-roading) is the interior plastics. The 3rd gen has nice quality interior plastics.
Oh yeah, i owned a 3rd gen...and i have never owned a 4th nor a 5th gen...but i am not blind by obvious facts either.