They're pretty hard to detect, and it depends how you're using it. If you're spamming messages within a second of eachother, then of course you'll recieve a punishment.
But I'm pretty sure it's a mute, probably a temp too.
Auto-talker are given a lot of leeway. Just don't abuse the chat when you are using it. Abuse leads to more abuse which makes for legit typing impossible
If you set one up to make it seem like there is enough time for a normal person to actually type between messages you shouldn't have much to worry about.
Using an AutoTalker will most likely going to get you a mute as punishment.
If you spam an message evrey two - three seconds, I don't think it'll be a problem. Avoid spamming evrey one sec.