There are 537,556 records in this collection of transcribed parish registers for various Essex parishes. There are no images of the registers.
It looks like someone was confused about English geography, perhaps in a rush to get this collection online.
"England, Essex Parish Registers, 1538-1900." Index. FamilySearch. https://familysearch.org : accessed 2013. Citing Church of England. England, East Sussex parish registers. East Sussex Record Office, Lewes, England.