Not necessarily. ED does not preclude other colleges from continuing to poach as they are not party to that particular student’s ED contract.
For example, my S applied ED, was accepted and then withdrew his apps like he was supposed to. Nevertheless, in early April, he received a letter from a top 50 school (one of his safeties) that said something to the effect, ‘we know that you may have already committed to another college, but I’m the Dean of [xx college] and we were impressed with your application (blah, blah, blah) and wanted to reach out with a full tuition+summer research travel stipend, and…’
Now, could poaching college be sued for torturous interference? Perhaps, but not worth the hassle.