We spent several years in a francophone ski station that attracted a fair number of Haredi tourists. My wife and I had several brief convos with them, and I'm sure from their side they were in yiddish, while from ours they were in german.

My favourite anecdote from this period was when my wife crossed a family on the trail at the lake, and one of the kids asked a question of the father about "the lady", as if she couldn't understand, and they were all surprised when she answered "sure, sure". ("doch, doch", written left-to-right, from her point of view; "dokh, dokh", written right-to-left in a different script, from theirs)

I wasn't trying to be pedantic :) The OP's claim was that they are essentially the same language. My point was that while they are mutually intelligible to a large extent, Hindi and Urdu are distinct languages. That was pretty much it.

I have no revisionist intentions here :)