Note that this cut in valuation has nothing to do with the blackout. It's actually old news. Forbes did mention it in their most recent article, but the majority of the drop in valuation was last year.

https://techcrunch.com/2023/06/01/fidelity-reddit-valuation/

Fidelity, the lead investor in Reddit’s most recent funding round in 2021, has slashed the estimated worth of its equity stake in the popular social media platform by 41% since the investment.

Fidelity Blue Chip Growth Fund’s stake in Reddit was valued at $16.6 million as of April 28, according to the fund’s monthly disclosure released over the weekend. That’s down 41.1% cumulatively since August 2021 when the asset manager spent $28.2 million to acquire the Reddit shares, according to disclosures the firm has made in its annual and semi-annual reports. […]

The substantial markdown of Reddit’s value by Fidelity predominantly occurred by the previous year. Nevertheless, it merits pointing out that Fidelity has persistently implemented minor reductions in the worth of Reddit’s shares in the ensuing months.