Trump says he will cancel all Biden executive orders signed by autopen
theguardian.com
theguardian.com
https://www.supremecourt.gov/opinions/19pdf/18-587_5ifl.pdf
So Obama's executive order was not de facto law; rather, the Trump administration violated the law in the way it went about shifting policy. And as the Supreme Court noted, executive policies can be changed — but statutory law must be respected when doing so.