EDIT: Not to mention there's a difference between what we're saying and what you're saying.
The reasons you hacking the server and winning 1,000,000$ are implausible are the facts that
1 - the server has protection against that kinda stuff, and while nothing is foolproof, someone willing to hack a MC server won't have the tech to break it easily. It's implausible from the get-go.
2 - There's no evidence at all that you hacked the server, no sign that you even entered the code.
3 - (added bonus) If you won 1,000,000 you'd be spending it not arguing over a MC server forum.
It's implausible that you hacked the server because 1 - protection and 2 - there's evidence to the contrary.
The reasons that someone getting a v7+ are the facts that
1 - It's entirely possible to get higher than a v7, and in a really long game it could have, and probably has, happened. It's plausible from the get-go.
2 - Multiple people are claiming that they've done it, and I'm claiming I've seen it happen multiple times.
It's plausible that someone somewhere has obtained higher than a V. 7 because of multiple witnesses
and no evidence to the contrary, not to mention it's actually possible.