Swiftkit will be safe, as Jagex made a mistake a couple years ago. When they accidentally banned users of swiftkit and they corrected their mistake. If they do it again just mention that you're a SwiftKit user.
Can someone confirm that "Grotworms" is now empty?
What's being done about the gold farming gamblers? Some gold farmers don't actually bot, and that's just as big of a problem. (Though the old servers have reduced the amount of gambling going on, one of the positive side-effects on the main game.)
20,000 is a lot though, I hope it's as obvious in game as it sounds like it'll be!
Any accounts involved in gold farming/trading will be picked up, regardless of whatever other activities they may put their idle hands to.
I am concerned about the "3rd party clients" ban though. I don't use SK, but I know many people who do. Is it against the rules now? How about DGSweeper?