From the news report-
"Nine burial mounds close to the site have already been identified as being of national importance, and there is evidence of others, two to the immediate south of the proposed development.
The site is also surrounded on all sides by crop marks – considered to be a significant heritage asset."

The mention of crop marks and the evidence of two mounds south of the development corresponds to the planing notes but the 'nine burial mounds' is a bit vague. Magic shows the remains of some barrows in the field around SE935438 including a neolithic oval barrow (one of Greenwell's) but there is a much larger group of about a dozen further north at SE91214569 that show up on the 1905 map as well as being listed on Magic. I wonder if the report is refering to these?

-Chris