Not true, read the original text of the 1964 act:
PROHIBITION OF CERTAIN USES
(c) Except as specifically provided for in this Act, and subject to existing
private rights, there shall be no commercial enterprise and no permanent road
within any wilderness area designated by this Act and except as necessary to meet
minimum requirements for the administration of the area for the purpose of this
Act (including measures required in emergencies involving the health and safety
of persons within the area), there shall be no temporary road, no use of motor
vehicles, motorized equipment or motorboats, no landing of aircraft,
no other
form of mechanical transport, and no structure or installation within any such
area.