Seriously, try to find any Venezuelan lawyer with experience in Constitutional law. All of them will agree that this "initiative to convoke" means that it has to be approved by the people first (like Article 347 says). If Maduro is so fond of democracy, why didn't he ask the people if they wanted a Constituent Assembly? There was no way to vote against the Constituent Assembly.
You're clutching at straws. As you can see by yourself, your claim is false, despite all desperate arguments you're trying to steal from the opposition's propaganda. The Constitution clearly states that the President can call elections for a new Constitutional Assembly.
Like it or not, the Petro is a fact.