It's a name change which will fool no one. The most important PSYOP/MISO function is a staff function to shape combat operations with the optimum impact on the other sides' culture and politics to change behavior in a direction favorable to us. This has to be taught to combat types all along the career stumble upwards.
The name change is also associated with a power grab between the official press, public relations, and psyop. There are legal restrictions in using PSYOP units on Americans, it's prohibited by law. Deception operations in the Pentagon are first, directed against the Pentagon, then against the Congress and the People. Renaming Renaming PSYOP to MISO may be intended to boost deception operations against Americans.
The term, "against" may be translated into other bullshit words like "information operations", "public affairs", and "educating the public". Renaming PSYOP is also a perception that PSYOPS is essentially deceit, and that propaganda is a lie. It can be, but not necessarily nor inherently.
Deception is a staff function of the S3/G3, but the lack of experience in PSYOPS in combat staffs renders our combat operations transparent. Sun Tsu famously characterized all war as based on deception. He was an optimist. Basic combat doctrine on operations orders stresses the everyone should know the commanders intent which is included in the mission statement.
Stonewall Jackson quoted Frederick the Great when he said that if a hair on his head know what he was up to, he would cut it off. The very notion of the commanders intent is destructive to the mission. This may also account for the fact that combat operations in area warfare (Vietnam, Afghanistan, and much of OIF) often go astray as the enemy knows our intent.
The combat advantage that we have leveraged successfully has been due to the fact that we can make a combat decision and implement it faster than most of our enemies. We can get inside the ODA Loop, the Observe-Decide-Act, developed by Colonel Boyd, USAF dogfight guru.