I think the parent agrees with you. The rhetoric around executive orders recently has spilled over from "I disagree with these particular executive orders" to "executive orders are inherently evil." In the Republican primary we saw people promising to repeal every existing executive order (because purple hearts and executive-branch pay scales are bad?). The parent was objecting to this, while certainly allowing that particular orders may be a problem.
Indeed! There's a tonne of things which rightly fall within the domain of the executive to make regulations, I happen to think that this immigration order goes way too far - and indeed even if it was made by the legislature it would still be immoral. I agree that legal != unobjectionable, of course!