From my sources inside Governor Sim Fubara's team, here is what happened.
Tinubu invited stakeholders in Rivers State for peace talk on how to resolve the political rift between Wike and his successor Sim Fubara.
On reaching there, they were all asked to signed attendance form.

Every one of them. Tinubu had a private meeting with Governor Sim Fubara and Dr Peter Odili. He told the Governor to his face that he has done no wrong, so has got no problem. Only for Tinubu to read out those conditions/directives at the larger meeting before everyone.

Sim Fubara didn't agree to any of those conditions, likewise Dr Peter Odili. He wasn't consulted for negotiation before putting out those directives. Shettima, Wike and Gbajabiamila had prepared those conditions and had given to Tinubu to read. Like he was directing one primary

School kid. After reading everything, Governor Sim Fubara left without signing anything.
But to make their forgery authentic before news men, they decided to harvest the Governor's signature from the attendance sheet and transfer it to the agreement, like a signed document.

Like Tinubu gave him a directive and he agreed and signed. It's all fake fake fake. Rivers people will resist this with their lives. Ijaw's will fight this even inside the Atlantic Ocean.
It easy to drag the horse to the steam. But you can not force him to drink.