Brighton and Hove Council has forced King Alfred developer Karis to resubmit a new environmental statement covering the project.
The request was detailed in a letter to planning consultant Hepher Dixon, dated 18 January.
However, Karis has denied rumours that Gehry is redesigning elements of the scheme or that he will not be fully involved until its completion.
Karis managing director Josh Arghiros has stressed that the scheme should be judged on the quality of its architecture.
Gehry added: 'We only work on projects if we're involved all the way through until it's finished and opened.'