That message is part of their "initiative" to let workers know if they're in trouble, at least according to what Electrolyte was told in 2017(?). So basically they just try to let you know you might get suspended soon, instead of outright giving you the boot. I helped a guy on Reddit a few weeks back that got that message; he contacted Amazon about it and they just gave him some dumb copypasta about working correctly or whatever. He just kept doing his thing, and as far as I know, he hasn't been suspended. If you'd like, I'll give you a contact address to see if it will help things.
It's worth noting that a lot of people get this message (especially recently), and Amazon is generally pretty sucky when it comes to suspending/warning the right people, so hopefully you don't feel singled out/at fault for this. There is a bit of a gray area regarding the use of scripts, but if they started banning for using MTS and the like, the userbase of this forum would practically die overnight.