The MSM was used to amplify the amphibious assault feint too:
Known as Magruder’s Principle, this form of deception is based on the idea that it is far easier to exploit the enemy’s beliefs than to alter those beliefs.
Magruder’s Principle served as the foundation for the plan. By November 1990, the Iraqi defensive array in Kuwait served as strong indication of how Saddam Hussein and his generals understood Coalition intent. The Iraqi command had significantly strengthened its defenses on the southern Kuwaiti border as well as on the Persian Gulf Coast. They had deployed several additional infantry divisions just west of Wadi al Batin but had done nothing to protect its open western flank. For the CENTCOM deception cell, the best means to achieve the goal set by Schwarzkopf was to reinforce the Iraqi preconception of the Coalition offensive campaign. To do this, the CENTCOM planners determined that their main target was Saddam Hussein who, in 1990, oversaw all aspects of Iraqi military operations, to include the placement of Iraqi forces in Kuwait and southern Iraq.16 The “story” aimed at the Iraqi leader was simple: Coalition forces deployments, actions, and announcements all indicated a ground offensive featuring amphibious landings from the gulf and attacks from the south toward Kuwait City and up the Wadi al Batin.
https://www.armyupress.army.mil/Books/Browse-Books/iBooks-and-EPUBs/Deception-in-the-Desert/