We are a commune of inquiring, skeptical, politically centrist, capitalist, anglophile, traditionalist New England Yankee humans, humanoids, and animals with many interests beyond and above politics. Each of us has had a high-school education (or GED), but all had ADD so didn't pay attention very well, especially the dogs. Each one of us does "try my best to be just like I am," and none of us enjoys working for others, including for Maggie, from whom we receive neither a nickel nor a dime. Freedom from nags, cranks, government, do-gooders, control-freaks and idiots is all that we ask for.
No, it's not. The maximum takeoff angle during an air show might hit 45 degrees but this is likely closer to 30. Telephoto lens and camera angle makes it look steeper. You'll notice that Boeing does not make that claim.
Impressive, but you surely noticed that the pilot held the plane on the ground longer than normal to allow it to get to a much higher speed than Vr. With extra speed, you can pull the wheel back and do that 7-second popup before getting back to level flight.
I'd also suggest that the plane had no passengers, no cargo, and minimum fuel for the stunt. Unloaded like that, the B737 has nearly enough thrust to go vertical.
We used to practice high performance takeoffs in the Lockheed P-3C Orion. I'm sure it looked very much like that when the bird is practically hanging on the four props...
Bear in mind that multi engine airliners are designed to what's called the 'Lindbergh standard', called for by Charles L in the '30's. It's essentially an airliner has to be able to function 'climb to height, operate, safely land' on one engine (in case of failures).
That means the 737 on full thrust on both engines has twice as much power as needed to fly, much less unloaded.
In the test out of the 747 in the '70's, a test pilot put one through a loop at 20,000 ft. Turns out he needed the altitude; when the wings aren't horizontal, they don't provide lift...
Meh. The "You'll Never Be This Cool" standard was set in 1955 when Alvin "Tex" Johnson barrel-rolled the Dash 80 (prototype Boeing 707) over Lake Washington in front of God and the president of Boeing.