We went a few weeks ago– I loved the harp in that score! It sounded very much like an electric harp to me. Just bought the soundtrack yesterday for my kids. It lists the harpists names but didn’t say if it was electric harp or not. It did mention “rendered harp solo” by Steve Tavaglione.
I was able to pick out some of it on the harp by ear –my kids were very delighted to hear me playing Wall-E!