During certification x-wind landing capability has to be demonstrated. The last aircraft I flew it was 29 knots because the day they certified it that was the actual wind. If the wind had been 30 knots that day, that would be the limit, that is why they call it demonstrated x-wind limit. It does not mean you can't land with a higher x-wind because the aircraft can't do it. Proper x-wind landing technique will always assure a safe approach and landing up to the limit every time. Improper technique as seems to be the case here will not. You never let the upwind wing come up in a x-wind landing. It doesn't matter if you do it with a yoke or side stick.