What exactly is Restrictive Early Action?

No you can’t. That’s the whole point of “Restrictive.”

In addition to the Yale source quoted earlier, here are some other examples which would bar applying EA to Tulane:

Harvard:

https://college.harvard.edu/admissions/apply/application-timeline/restrictive-early-action

Stanford:

https://admission.stanford.edu/apply/decision_process/index.html

Princeton:

https://admission.princeton.edu/how-apply/application-dates-deadlines/single-choice-early-action