This video doesn't prove your point. Not only are they actually not directly under that, but this is spread over a much larger distance than trying to target the cathedral would be. They configure their release to spread over a larger area than that.
It proves you can effectively firefight with water from a plane without even snapping tree branches, thus there'd be no reason the same pressure couldn't be used on a building.
I think I found out the reason everybody is going so crazy over this - a controversial figure from the wrong tribe apparently mentioned flying water tankers. Thus even neutral debate over the subject is wrongthink and has to be extinguished.
Why don't you step back for a moment and just admit that given the premises
-Firefighting airplanes can effectively spray in a way that doesn't harm trees
-Buildings are fine in extended substantial downpours
That it must follow
-Spraying a building with a plane in such a configuration would not collapse it
Otherwise you are the clueless one. This is absurd. At least you downvoters (who are ignoring the site guidelines) are letting me see some aesthetically pleasing upvote configurations again when it goes back up, so I appreciate it.
That's much more volume at once in any one area and much closer to the subject (so less time to dissipate) than any of the actual flying water tanker videos that have been posted.
A DC-10 Air Tanker carries 12,000 US gallons https://en.wikipedia.org/wiki/DC-10_Air_Tanker
All said, that's 45.4 metric tons.
Go ahead, stand under one and let us know how it goes.