In my personal opinion is because Mr.Bukele is aware that it is not the same to invest in Bitcoin as a company and as a country. El Salvador invested a modest quantity of money and yet they were target of a FUD campaign against Bitcoin adoption in the country, having organizations like the World Bank and the International Monetary Fund frowning upon such economical choice.

The adversaries of Bitcoin and decentralizaction are already quite annoyed by the fact Bitcoin evolved from a project for internet crypto-punks into an asset held and traded by companies, according to them that was never supposed to happen, Bitcoin was supposed to be a "scam" from the beginning in 2009. You could imagine how shaken they felt then El Salvador took the first step forward from asset to National currency.

It is not the same for the media artillery aiming to a company holding unrealized losses than a country being in the same position. Shareholders expose themselves to risky seeking profit, the people of El Salvador are not shareholders.

So I think it was just Bukele being cautious.