Haven't the RS devs confirmed already that they can see what client you are using?
I just posted about a ban I got using Night's Magic AIO, which I also used Stealth Mode instead of Mirror Mode (for the first time on this account ever, I usually always use mirror mode), and got a temp ban. (even though I only used Stealth Mode for < 1 hour.)
To me, it seems unlikely that this was the script (it could have been though I guess.)
I reckon it was the fact that I was constantly changing clients. I would run RuneLite while playing legit, have to logout and close that to open