In this electronic age, it takes great effort to erase your foot print. Why all the effort?
He apparently was a CIA asset when his mother was living in Pakistan.
I doubt Obama has those web links scrubbed. They probably either expired or were taken down when the errors were discovered.
I do agree he should release the long form, not to mention all his college transcripts. Unless he is intentionally keeping the controversy alive, as a distraction, I can think of no reason he would not release these documents, if doing so would prove his US birth and his academic excellence.