They specifically call out why the semantics matter in the actual article, in the first paragraph.

> President Donald Trump premised his mass deportation agenda on the idea that he will be “returning millions and millions of criminal aliens.” Department of Homeland Security (DHS) Secretary Kristi Noem has repeatedly claimed that they are arresting the “worst of the worst.”

When speaking to Trump supporting friends who employ illegal immigrants they specifically defend that it is only the "bad ones."