This is what AC-25 7A says, and it supports the ideas that I and Mad Scientist put forward - I initially thought of the Buccaneer too, but couldn't think of any civil types that used boundary layer blowing. As you say, perhaps it was imagined it would come into vogue!
1.2 times VS for two-engine and three-engine turbopropeller and reciprocating engine-powered airplanes and for all turbojet airplanes that do not have provisions for obtaining significant reduction in the one-engine inoperative power-on stalling speed (i.e., boundary layer control, blown flaps,
etc.).