Think youre missing the point.
It *is* decentralized.
As far as being detached from fiat currency and the stockmarket, the selling point for BTC is that it seeks to be so. I don't think Satoshi ever suggested it had achieved that goal.
Like I said, im sure you could come up with some random crack pots that argued something like that, but no one serious.
Redo your search and ask if Satoshi or Saylor has ever claimed that it actually had detached from the broader market, or if that was just something it had the potential to do.
Edit- Here's a better search using your precise terminology:
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