Funny way of not filing
"Pure Storage is a private company and does not disclose our financials"
"Pure Storage has a strict policy not to disclose or provide guidance on financials to third parties"
"Pure Storage's S1 IPO filing said it recorded $42.733m in revenues"
So they do, in fact, disclose their financials to third parties. Perhaps not on an annual basis as a matter of routine, but that's not really relevant to the fact that they have disclosed the relevant figures. It can hardly be considered a breach of the law to discuss anything following the S1 filing, when it's that exact filing that has the numbers in the first place.