Lee - your observation is correct. MOST of the links state that the story is MYTH, with not physical or other evidence to show that ever occurred. Story began in England during the middle ages - no other documentation prior to that. IF sources like that are credible, then we have to say Jesus went to India as well and was married.
Most times I've seen this bit of legend/speculation/special pleading about J. of A. it's been hitched to the British Israel-ite wagon. That can range from mildly crackpotish, to stuff like Herbert W. Armstrong's sect that's completely beyond the pale.
This is the first time I've seen it used to support the prosperity "gospel".
That was my impression too - Anglo-Israel range of wackos.