Initially, Sifo-Dyas was supposed to be an alias for Sidious which is why in the movie the Jedi Masters state they've never heard of a Sifo-Dyas. Later that was ret-conned, and Sifo-Dyas became a separate entity from Sidious and was a Jedi who had been manipulated by Sidious through his friend Dooku to order the Clone army. Later he was killed in a duel with Count Dooku who then preserved the body and kept his lightsaber. Eventually, Dooku used the frozen Jedi's blood in a transfusion to keep Grievous alive while they turned him into the cyborg General Grievous.
Ultimately, Sidious is still responsible for the actual Clone army being ordered.
What? No in the movie, the jedi have heard of Sifo-Dyas this is what obi-wan and the cloner said.
Prime minister: "Jedi Master Sifo-Dyas is still a leading member of the jedi council is he not?"
Obi-Wan: " Master Sifo-Dyas was killed over 10 years ago."
Obi-Wan: "They say Master Sifo-Dyas placed an order for a clone army, at the request of the senate almost 10 years ago. I was under the impression he was killed before that."
So Master Sifo-Dyas was an actual jedi master.
Edit: Wait nvrm I get what you mean, yes in the early drafts of ATOC he was but after that he wasn't so it was never ret-conned since it wasn't the actual script. Thought you were meaning it in some other way.