El Salvador already amended that law, and right now merchants no longer have to accept BTC if they don't want to, so we can say it is no longer a legal tender.
From my view anyways, I think the legal tender status still remains, since they only make it clear that they can choose between, so as not to make it what they impose on the people,
This has nothing to do with your view, a legal tender is not a voluntary means of payment, you are actually obliged to accept a legal tender whenever it is offered as a method of payment or as an exchange for any transaction. However, that is no longer the case in El Salvador, as they had to revoke the legal tender status in order to receive a loan from the IMF.
A borrower will always abide by the conditions of the creditor. IMF ensured that they destabilized El Salvador's vision to maintain its status as the first country to make Bitcoin a legal tender. Thankfully IMF didn't force them to sellof their hodling or stop them from accumulating more coins.
Maybe some of these Investors believe that he could use his position as president to bring more fortune to the company through market manipulation.
He is good at market manipulation, some of which should be illegal, but that could rightly be part of the reasons too.
Some Democrats have alleged that people who are part of Trump's inner circle have pre-information about his tariff policies. This has helped them to make from his market manipulation. Trump rules like an emperor, nothing is illegal with him. Even the court is helpless sometimes.