I don't see it. The Gizmodo article sources this TechCrunch article, which says (emphasis mine):

Fidelity Blue Chip Growth Fund valued its holdings in Reddit at $15.4 million as of May 31, according to the fund’s monthly disclosure released Friday. That’s down 7.36% from the $16.6 million mark at April’s closure and altogether a slide of 45.4% since its investment in August 2021. The updated share value suggests a $5.5 billion valuation for Reddit

Yeah Giz is reporting that the valuation has been sliced after the protests, but their own source disagrees with them