No. TSA doesn't search smartphones and laptops, and the searches they do apply to everybody. When you search everybody equally, courts have ruled it's not a 4th amendment violation. See drunk driving checkpoints.

I don't have a source at the ready, but my understanding is that the existing law and/or case law determined that traveling domestically entitled one to such protection. Various federal agencies have determined via rule making that such protections do not extend to international ports of entry/airports for reasons of national security. Those determinations are what have been struck down in this case.