Yep. Peter definately auditioned. Here's the face book conversation that metalpete mentioned
On October 22nd one of his friends says
(Rough translation) Good Luck Peter, hope it went well
Peter's response on the 22nd of October: Thanks Pelle. It has gone well. See you Monday!
Also, whenever someone on facebook asks aout Dream Theater on his page, he never answers, but he answers every other post.