It's bullshit. I've lost 6 times in a row twice, on a flat out maxed account and got cleaned both times. The last time it happened I went on a nice streak of like 9 wins 3 losses, all was good then got pwned for bank 6 times in a row out of nowhere.
You can never be sure with Runescape, losing streaks like this is how people get cleaned. Only do this if you can double it 10 times at least just to be safe.

