This doesn't seem faster/worse that previous such cycles?
I think we need to be clear on what we're looking at in that blog. Here's the 5-year development:
As said, this has been going on for quite some time.
The charts shown in the blog are a bit more ambiguous in their interpretation. Note also that the discussion is very specifically about one aspect of trade (and a very small one at that; note the total assets in these funds, which are...well, tiny), and that the article notes that...
Goldman believes this squeeze will be temporary expecting that within 1-2 weeks we’ll see significant physical inflows from China and the US into LBMA and the curve ultimately eases
I'd be cautious in drawing any conclusions from this for the photographic industry. Are precious metal prices on the rise? Yes, absolutely. That's nothing new, though.
PS: for some more historical perspective:
It's not unprecedented that silver is skyrocketing. It does this every once in a while, generally for fairly obvious reasons - i.e. increased risk perception in the stock trade and/or general lack of confidence in the economy, resulting in a flight into noble metals.