I don't really feel like this is the appropriate place to get into this and don't want to get in the habit of discussing tourbans in public, but this ignores the reality of the situation. undisputed told me personally on multiple occasions that he was in the region in question, and twice he asked for something he could screenshot guaranteeing him that he was good to go.
This also ignores how most questions re: eligibility come up. Most people with questionable eligibility will contact TDs for approval before signing up for a specific location. What you are suggesting would mean that there was literally no risk to breaking the established forum rule against proxies in an effort to game the WCOP system. If you wanted to play for, say, Northeast, there would be nothing stopping you from purchasing or finding a VPN service or proxy to falsify your IPs and asking a TD if you qualify. If the TDs catch you, well, no harm done, you haven't signed up yet, right? If they don't, you're good to go. Even if we said that such actions disqualified you from participating in this edition of WCOP, that would be no drawback for someone who didn't like their team or wasn't intending to play with the team they qualify for. It undermines the integrity of the tour, because you might as well try to proxy your way onto the team you want (despite proxies, again, being against Smogon forum rules) rather than playing for the team you are legitimately eligible for.