The assumption that the tower would fall over at a certain floor tilt seems to rest on the premise that the opposing sides of a Jenga block are perfectly flat and parallel, and orthogonal to one another.
If they aren't then the blocks can be rotated relative to one another to cancel out floor unevenness.
My thoughts exactly. This article is obviously written by a Jenga novice.
Yes.
Or what about stacking off-center/cantilevered against the lean?
I was never very good at these physical engineering problems. I was always really impressed by my classmates who understood it intuitively.