If people are insinuating that Cruz wasn't in D.C. in 2007, that's right. However, my understanding is that the phone numbers and names go back years, and cover periods way before 2007. Guess who was living in D.C. until 2003? Ted Cruz (everybody should know this, thanks to his wife having a public breakdown over having to move to Texas).
Maybe she had a breakdown over his cheating. It would be absolutely lethal to his campaign if there were actual proof of him having extramarital affair. The effect would be even stronger because of his earlier adamant denial. And Trump's numbers would shoot through the roof.