I've watched a few of his videos a while back but don't recall cooking his dishes.
As for Kashmiri Chillis, there will be no absolute certainty that what you buy, labelled as such, will be anything other than a chilli, although the shape is definitely more like the ones on the left. It is most likely that anything we see labelled Kashmiri will actually be from Byadgi market. The ones on the right of the photograph look like chillis I've grown called Indian lal mirch which simply translates to red chilli.
Have a look at the handfull grabs this guy picks up. We don't see these where I live. I wish I knew what they are saying.
https://www.youtube.com/watch?v=ERWdXc6aCdwThe necessity of soaking dried chillis is questionable. There is absolutely no reason why you couldn't substitute fresh, or use powdered or even a blended product like MDH Deggi Mirch to achieve the flavour and colour desired.
Let us know how you find the dish once you've cooked it.