I was reading A Bust to the King's Gambit by Bobby Fischer. The game starts with
1 P-K4 P-K4 2 P-KB4 PxP 3 N-KB3
[FEN "rnbqkbnr/pppp1ppp/8/8/4Pp2/5N2/PPPP2PP/RNBQKB1R b KQkq - 0 3"]
Bobby Fisher commented that
"the move I played 3...P-KN4 against Spassky, but this is inexact because it gives White drawing chances in the ensuing ending: e.g., 4 P-KR4 P-N5 5 N-K5 N-KB3 6 P-Q4 P-Q3 7 N-Q3 NxP 8 BxP B-N2 and now 9 P-B3! (replacing Spassky ’s 9 N-B3) 9...Q-K2 10 Q-K2 B-B4 11 N-Q2 leads to an ending where Black’s extra Pawn is neutralized by White’s stranglehold on the dark squares, especially KB4."
It seems that the move 3...P-KN4 is still played frequently even today (even more popular than Fisher's recommended move P-Q3). So does this mean that Fisher's conclusion that "3...P-KN4 ... is inexact" inexact?