Comparing the length of one object with the height of another object from an entirely different domain is simply an inapt analogy.
The "how well does it float" remark was just pure, unadulterated and gratuitous Internet snark.
This is FR, after all...
Most Europeans are familiar with the Eiffel Tower and it gives them a perspective on which to gauge. But okay, I get it, you were being snarky.