That is a magnificent hillfort. I think I read somewhere that it was incorporated into Wat’s Dyke.
I think the part I didn’t excerpt discusses its proximity. Wat’s Dyke was kinda offhand attributed to a response by one of the Welsh kingdoms to Offa’s Dyke, but research in the 1990s uncovered RC-datable remains, turned out to be centuries older than Offa and his dyke, so, perhaps Wat’s Dyke inspired Offa’s Dyke. :’)