Looking online at Southend's planning portal, I am not sure that application 19/02066/BC4M has been withdrawn. Some revised plans were only submitted on the 11 March 2020 and it still shows a target decision date of Friday, 3 April 2020. Indeed the application also still appears on Rochford's online planning portal under reference 19/01028/FUL.
It would be very short sighted if they have withdrawn the application given that permission (if granted) will last for three years.