The article says All Hallows was founded by the Abbey of Barking, a 12th century Benedictine foundation, so it’s hard to see how the church could be 7th century. In the case of Barking Abbey, despite its wealth Historic England reported that not even the foundations survive and the ruins have been dated 12th century.
A detailed Wiki article points out that "The origin and early history of All Hallows-by-the-Tower church are obscure"
and this sense of caution is echoed by church archaeologists/ historians questioning its claim to be "the oldest church in the City of London"
"Recent research, and archaeological evidence that Roman tiles and stone were being used in the construction of other London churches as late as the 11th century, suggest that the arch could have been constructed at any time between the 7th century and the arrival of the Normans.[6][5] Fragments of three 11th-century stone crosses also found during archeological work in the 1930s and clearance works after the bombing,[9] now displayed in the crypt, also date from this first church"
https://en.wikipedia.org/wiki/All_Hallows-by-the-Tower
Something is not right. This message is just to keep things from messing up down the road