I generally keep out of crypto discussions as I do not sufficiently understand it. But this event is very easy to understand. In the beginning of the article itself:

... approved last Wednesday a confusing reform to the Bitcoin Law at the request of Bukele’s government, which had no other option to receive the $1.4 billion credit agreed in December with the International Monetary Fund (IMF).

Thus, this move was forced on El Salvador by the IMF.