That pic of him throwing the racquet does NOT look like an extended length racquet so I don't believe it's the new 200G XL. It is probably a customized standard length HM 200G. Also, on the new 200G XL, the "DUNLOP" logos on the 3 and 9 o'clock areas of the head are black colored or clear with white outlines. On the regular 200G, the logos are white or silver like the one in the pic.
Besides, McEnroe is so old school he refuses to even use an overgrip or synthetic grip and insists on using a bare leather grip (as in the pic). I'd bet he still uses only all gut strings, too. So it doesn't surprise me he wants a 13oz., flexible, standard length stick with a leather grip and gut strings. Remember, he did win most of his Grand Slams with a wood racquet, so he probably wants to replicate that feel.