I don't know the specifics but I was under the impression that a current POTUS could amend or cancel the EOs of their predecessors.
Which is why the SCOTUS decision was such a surprise.
This decision will undoubtedly be overturned by a future (legitimate) supreme court.
However, since they gifted POTUS this new authority, until it is overturned he intends to use it.
His signature now has more power than congress. And [they] gave it to him.
So he's going to use it while he can.
And they will get buried by their own corrupt rules.