I think there is one key minor word change you need that makes it much more palpable...
He said "Greatest Finals PerformANCE". Different than "Greatest Finals PerformER". Huge different in Wade's case, as he's been to 1 finals. But his near 35 point, 8 rebound, 4 assist average in that series is obviously great.
Not sure it really surpasses Shaq in 2000, 2001, 2002; Jordan in 1991, 1992, 1993; Duncan in 2003; Kareem in 1980; Hakeem in 1995; Bird in 1986... well, you get the idea.