Well, looking at the video from the bar near the end of the runway, that was pretty damn low. Not only can you see the wake, you see the pressure wave in front of the wings, so they were in ground effect.
Looking at a relative comparison from the video from the shore, the red line is the wingspan 112' (34m) and the green line is the distance from wheel to the water surface. The comparative lines show at this point, just as the aircraft begins GA, (and still a distance offshore) appears to show about 52' (16m) above the water surface.
https://www.youtube.com/watch?v=fXCJPHRErZ8
Should be about 50' (15m) at threshold.....
Best to review the actual video to see the water surface, etc used for the comparison.
In regards to the procedure designers adding the decent profile, that is of course, how the procedure is designed, what is charted is up to the State and the particular criteria it has decided to use.
From a previous post in this thread, this needs to reference the threshold, not beginning of pavement. TCH here is 50 feet.
EDIT: BTW, looking at the Frozen ac, they used about 1925 lbs of paint for that.....pretty good hit on the MLW! For Canada, that is like 7 pax w/cheese....