I think the landing impact was exactly as intended.
A positive touchdown might just of shaken the errant gear leg down.
What a total nonsense, in addition to the usual "job well done" drivel!
Of course you don't want to waste valuable landing distance (QRH says 8020' for F30, 290T LW, Gear Disagree one wing or body gear up), but quite honestly I don't see any reason to plant it down like this. Lucky they didn't break or overstress the remaining gears.