Ambode tweeted that he commissioned it

We took a tour of the Eko Atlantic City with Mr. President as he officially commissioned the project. Eko Atlantic is a good example of what Public and Private partnership can do to the Nigerian economy.

Presidency tweeted denying it

President @MBuhari did not commission or launch Eko Atlantic City. His visit was a tour, as part of his 2-day Official Visit to Lagos State, and the plaque he unveiled was to commemorate the visit to the site.