Liberal YouTubers

The motion was ruled out of order because it was a business meeting (rather than a hearing).

But it isn't the motion to subpoena that's a nonstarter (though it's likely that Noem will only testify when the majority wants her to)... the underlying concern simply isn't correct:

Members of Congress have the authority to provide oversight on ICE facilities

That's simply wrong. Congress has oversight authority and can delegate it to committees (which can send individual members of Congress and/or their staff). But those individual members have no such authority on their own, and Section 527 doesn't say otherwise. What it does say is that when Congress is performing oversight of these facilities, the executive branch can't spend any of the appropriated funds to prevent a member of Congress from entering the facility "for the purpose of conducting oversight". The problem is that individual members don't have the ability to declare that they're conducting oversight.