If Jesus was who he said he was, then he could have predicted the future along with many other miracles.
Overall the article is okay – but I disagree with the beginning premise. I would not consider it a solid argument for an early dating of Mark’s Gospel.
I still date Mark’s Gospel after 71 – but before 75. Honestly, I would date it right around 72, but to narrow it down that far is too much.
Anyway, give the article a read.