Here is one of the ERA Project’s scholarly memos that the Heritage Foundation was responding to in that article, if you’d like to brush up on the counter-arguments!
Possible Avenues for Action Related to the Equal Rights Amendment
Resolutions have been introduced into both the House and the Senate declaring the Equal Rights Amendment (ERA) to be fully ratified as the 28th Amendment to the U.S. Constitution. There are other legislative steps that—while short of declaring the ERA fully ratified—could be taken to advance the measure toward final ratification, and to create political facts that would reinforce the position that the ERA is already the 28th Amendment.
You can download as a PDF.