In an unprecedented move, the band/management has made EVERYONE involved in the tour so far, sign ND agreements (Non Disclosure). In layman's terms, by signing one, you legally agree to: Keep your f***ing mouth shut about everything!
Whether his info is accurate or not, this "spoiler source" who signed one of those agreements, chose to thumb his nose at it and rather, share alleged info with someone who admittedly opened at least one account on a forum, to specifically go public with it.
Your "source" is a person of little character who has zero respect for the Rush organization. And neither do you, My Friend... neither do you.
Er, you know for a fact that the source signed one of those agreements? You do realise that at this stage of the process there will be quite a few people who are not part of the Rush organisation who will have had the opportunity to hear rehearsals?