They literally said they are working closely with the game developers and that alecaframe will not get me banned.
From https://support.warframe.com/...
We would like to make it clear that our involvement with Overwolf is simply that we’ve had conversations to ensure that Warframe’s EULA and ToS are not being breached in any way.
Overwolf is somehow getting your inventory from the game. Speculation is it's reading memory or network traffic. That is, in my interpretation, a violation of the TOS, but they were somehow getting away with it (or DE were being lenient, because it's not really that big of a deal to get your inventory out of the game).
Since you've been banned twice so far, I'd recommend you stop using it. I'm surprised you got your ban lifted the second time.