I'm not denying it. There's no way Modi could have pulled off 370 of without tacit US approval. I'd even go so far as to say that US might one day even secretly encourage India to launch military campaign in GB and AJK, in order to disrupt CPEC when China becomes too big of a threat. But this US-India alliance is currently only against China, not Pakistan. This is all the more reason the we shouldn't completely antagonize US and show them some carrots i.e., trade, access to Central Asia etc.
US as of now prefers the status quo line (LoC) to be the border. US investments in GB and AJK will be seen as its approval of these areas being part of Pakistan (and that's a HUGE thing, because Pakistan's own stance regarding Kashmir is that of the UN, i.e., areas even under its own administration are disputed).