I'm sure Steam is capable of tracking your conversations, but I highly doubt that they were watching you and kicked you off on sight of something that may have unnerved them. Besides, if they had reasonable evidence that you were plotting to do something against their policies, either one of their representatives would have contacted you, your steam status would be knocked out of "In good standing", or you would have been flat out banned.
Your situation was just a coincidence.
My recommendation though, whatever it was you were planning to do, don't.