Please read the section I copied. It doesn't appear to me that it changes the sleeping arrangements because the wording says it is limited to the current law. Which in my mind makes it null and void until the law is changed.
From the EO:
It is also the policy of this Administration to maintain family unity, including by detaining alien families together where appropriate and consistent with law and available resources.
Consistent with the law..thats the key word, current law says keep the kids separated. So, if anyone tries to sue..hes abiding by the law right?