A demonstrated crosswind component isn't a factory recomended crosswind component. It's the max crosswind the test pilots had during the testing process on a given day. If the winds were howling at 70 kts of crosswind during the test and eval process, then the demonstrated crossind would be 70 kts...but that wouldn't make it a good idea or safe practice with a full load of passengers in air carrier ops.
PART 25—AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY AIRPLANES
25.233 Directional stability and control.
(a) There may be no uncontrollable ground-looping tendency in 90° cross winds, up to a wind velocity of 20 knots or 0.2
V <e t="24">SR</e><sub>0</sub>, whichever is greater, except that the wind velocity need not exceed 25 knots at any speed at which the airplane may be expected to be operated on the ground. This may be shown while establishing the 90° cross component of wind velocity required by §25.237.
(b) Landplanes must be satisfactorily controllable, without exceptional piloting skill or alertness, in power-off landings at normal landing speed, without using brakes or engine power to maintain a straight path. This may be shown during power-off landings made in conjunction with other tests.
(1) A 90-degree cross component of wind velocity, demonstrated to be safe for takeoff and landing, must be established for dry runways and must be at least 20 knots or 0.2 V<sub>SR0</sub>, whichever is greater, except that it need not exceed 25 knots.
25.237 Wind velocities.
(a) For land planes and amphibians, the following applies:
(1) A 90-degree cross component of wind velocity, demonstrated to be safe for takeoff and landing, must be established for dry runways and must be at least 20 knots or 0.2 V<sub>SR0</sub>, whichever is greater, except that it need not exceed 25 knots.
For Part 23 operations it is different:
23.233 Directional stability and control.
(a) A 90 degree cross-component of wind velocity, demonstrated to be safe for taxiing, takeoff, and landing must be established and must be not less than 0.2 V<sub>SO</sub>.
(b) The airplane must be satisfactorily controllable in power-off landings at normal landing speed, without using brakes or engine power to maintain a straight path until the speed has decreased to at least 50 percent of the speed at touchdown.
It has nothing to do with 'luck of the draw' on test day...