<...> Maybe they are afraid that their salary in USD will turn into Satoshi with 1:1 exchange rate.
Although things may change at some point, the current stand is that salaries and pensions are to be paid in USD.
Back in mid June 2021, the Minister of Labour hinted that
bitcoin was being considered for salary payments. Nevertheless, the standing Law of Monetary Integration prevails, and has not been altered nor replaced or amended by the recent Bitcoin Law, thus salaries are still mandated to be paid in USD and not in bitcoins. The latter was reaffirmed yesterday by Javier Argueta, a legal advisor to the presidency (see
https://twitter.com/dialogo21/status/1435237512532971532).