Very misleading. If you're solely looking at the price, it was on June 8th 2021 that El Salvador Legislative Assembly voted to make Bitcoin legal tender [1].

The price of Bitcoin on June 8th had a intraday low of $31,114.44 USD [2]. The price of Bitcoin as I write this comment is $30,144.71 USD[2].

Yes, its down slightly since they signed it into law, but hardly tanked.

Sure the price of Bitcoin went a lot higher AFTER they decided to use it as legal currency, but the headline is very misleading.

[1] https://www.asamblea.gob.sv/node/11282

[2] https://coinmarketcap.com/currencies/bitcoin/historical-data... (pick June 7-8 2021)