Update: Was banned after about three ish days of botting about 6 hours/day sometimes spread out throughout the day (I only bot while I'm around my computer). Used coal bag, made about 21k bars, no potions, no anti ban (bar production drops to about 400/hrs, entirely unrealistic), mirror mode, lots of breaks (with longest bot run time being three hours).
"Account temporarily banned for macroing in OldSchool. Our macro detection system has been monitoring your account closely and has detected that you are using illegal 3rd party software which violates the rules of the game and breaches your terms of service with Jagex. Our team have reviewed the evidence and can confirm that you were using illegal botting software. Jagex are able to accurately detect all illegal 3rd party software and any promises from their makers about being 'totally undetectable' or 'no ban guaranteed' are inaccurate. As such your account has been temporarily removed from the game. Please take this time to familiarise yourself with the rules."