As illustrated in tdracer's post #100, and testified in the FAA's Final Rule on the matter, the 'placard' is now in the Airplane Flight Manuals of all transport category airplanes flying in the US.
The private citizen noted the proposed amendment is not retroactive, so it would not fix the problem for existing aircraft.
Although the proposed amendment would not be retroactive, the FAA has worked with airplane manufacturers to amend their AFMs for all major transport category airplanes used in U.S. operations. The wording now in the limitations section of these AFMs meets the requirements of this final rule.