congress has the power to overrule with a joint resolution
We just might see that happen.
I asked on another thread how certain you are of that. Since you repeated it you must have some basis for it. Is that language in the National Emergencies Act statute itself? Because my understanding was that Congress gave POTUS the ability to redirect related funds in a national emergency declared by POTUS and the only way out was for a new law to repeal or amend the Act. But you could be right that Congress can undo it by simple majority of both chambers. I could see the logic in Congress trying to keep some strings of control as a check on Executive over-reach because an ED is reallocation of funds allocated by Congress for other, if related, uses. If so I am surprised the effort isn't underway to pressure GOP in the Senate to strip 5 votes.