this title/headline is ambiguous as to what it means.

claim: "Medieval staircases were built going clockwise for the defender's advantage"

counterclaim: "no they were not; medieval staircases were not built going clockwise for the defender's advantage"... it was for a different reason, or even, they weren't even built that way.

clarifying original claim: "Medieval staircases were not built going clockwise for the defender's advantage, they were built counterclockwise."

confused? me too. and the site is called "fakehistory..."?

The title should be, "Exploring whether medieval staircases were built with chirality to benefit right handed defenders."