De-dolarization seem to be happening even before Biden, they know a few countries are sanctioned through Swift so they know possibilities since then.
If the US did the right thing by making countries and allies feel important, it would continue to dominate politically, and possibly, the de-dollarisation agenda may fail or be weakened. Not what Trump is doing, that friends, partners and allies are now like enemies. They wouldn't care about another alliance.
Even if Trump were not president or if he did not do all those things to harm allies and the world, that would not stop the BRICS de-dollarization agenda. Simply because the world has seen the true nature of the US and NATO over the past decades. The world is tired of a unipolar, dictatorial world. What other countries want is a multipolar, more equitable world. What Trump is doing is only helping to accelerate the de-dollarization process and attract more countries to join this revolution.