Won’t change anything.
Blue states will continue to pass it.
Next time there is a Democrat POTUS a new AG will do a 180 and....presto.....stroke of the pen, 28th Amendment.
The DOJ is correct and is simply enforcing a federal district court decision in NOW v. Idaho that declared the ratification window for the ERA expired in March 1979. Appeals to higher courts and the Supreme Court failed decades ago.
To revive the ERA, the Supreme Court would have to reverse its 1921 decision in Dillon v. Gloss and modify its 1939 decision in Coleman v. Miller. These two decisions form the backbone of the relationship between Congress and the amendatory process under Article V. Changing these decisions would throw the amendatory process into constitutional chaos, which is why the federal courts won't touch a state-initiated suit with a 10-foot pole.
The AG doesn't fit into the equation.