It's hard to tell given the private stock and all, but the article mentions that there's reason to believe the company hasn't taken quite as much of a haircut as comparable ones that are already on the public markets:
> In March, Fidelity, required to publicly update the value of its holdings, marked down Stripe by 20%. Most unicorns—startups valued at $1 billion or more—are trading on the secondary markets at 20% to 40% discounts to their last official venture capital rounds. But Stripe’s shares remain hard for new investors to obtain and in high demand, with recent transactions implying a valuation of as much as $165 billion, per New York–based EquityZen, a marketplace for pre-IPO shares.
> In March, Fidelity, required to publicly update the value of its holdings, marked down Stripe by 20%. Most unicorns—startups valued at $1 billion or more—are trading on the secondary markets at 20% to 40% discounts to their last official venture capital rounds. But Stripe’s shares remain hard for new investors to obtain and in high demand, with recent transactions implying a valuation of as much as $165 billion, per New York–based EquityZen, a marketplace for pre-IPO shares.