Hi Anne,
I also searched through the online version of DWB and couldn’t find anything.
I’m perturbed though that although his name in the biography is John Lloyd ap David Lloyd (i.e. John Lloyd son of David Lloyd), John’s father as linked in Wikitree is named Evan Lloyd.
Since the only source for Evan Lloyd is an Ancestry tree, he is almost certainly incorrect, but I don’t have access to the sources to confirm that.