Hate to say it Aeglen, but that's not a user-error.
I've tested this script a numerous amount of times and could not get any account to get anywhere near 500.
I've been botting for years as well. So not a user-error on my part too.
This script was features in a SirPugger video and like SirPugger stated very clearly, Jagex has something place to catch this script within only hours to be confident enough to ban the account.
Honestly, I'm completely dumbfounded on what they are detecting, but they are definitely detecting something in this script.
I've had some accounts banned with less than 30 minutes of gameplay with this script and have gotten banned.
Also, while skimming the webhooks I noticed the highest total level was 601 and the five random accounts I picked to view are all banned.