~ but say with this current drop In price if I moved bitcoin outside of the US and to an El Salvador wallet, would that be saving on the future sale of bitcoin or what would that look like for capital gains?
You probably have to physically move to El Salvador and change residence/citizenship to avoid US taxes. It doesn't matter which wallet you move your bitcoins especially if it's been declared or already accounted in a custodial platform/wallet/centralized exchange To be honest not everyone like taxes 
The OP's opening sentence was an obvious sarcasm. He's finding ways to avoid it if you read the whole post.