it has also been confirmed in a signed letter by the Minsiter of Finance as well as the head of the Central Bank for El Salvador that no bitcoin has been added since February

This isn't an IMF v El Salvador situation, its marketing v reality

The transfers might be quite elaborate--such as literally 'selling' from one wallet and 'buying' the same amount and sending it to another.

If El Salvador shared the same info with the public as they did with the IMF (their total holdings across all wallets) it would immediately provide clarity. The fact that they don't want to tells us they do not want the clarity that would bring

Two things seem confirmed at this point: El Salvador was forced to stop accumulating bitcoin at the behest of the IMF & El Salvador wishes you didn't know that