Could be, because he beat Super GM Bent Larsen so soundly, playing against it as Black.
https://www.chessgames.com/perl/chessgame?gid=1044712
Fischer played the Bird's once!
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https://www.chessgames.com/perl/chessgame?gid=1044334
Why not twice?
Because he was rather successful using it the one time he did, to defeat a "World Champion."