Lenborough Hoard Found as a Result of Targeting Rectangular Earthwork?

In the article  'How a metal detector and Google Earth are helping one man uncover the past' we learn something new about the scandal surrounding the discovery and rapid hoiking of the Lenborogh Hoard , Mr Welch claims that targeting sites on the basis of traces seen on Google Earth is how he can fill his pockets with valuable artefacts:

but nothing compares with Peter’s biggest find: a hoard of Saxon coins valued at over £1.5 million [...] In December 2014, Peter noticed a square mark in a field with Google Earth. It was in this area where the Weekend Wanderers discovered the £1.5 million cache of Saxon coins.