The maximum x/w component for a particular aircraft type is demonstrated for certification purposes only. this does not mean that you or the aircraft can't be capable of landing in excess of this figure.
And, the point is, Mothfly
thought it was a limit! Maybe it is on the Tiger Moth?
I'm not wanting to castigate our friend Mothfly, there's always more to a story, again, I'm genuinely interested to know more. I'd love to fly one, one day!