It is. An "inaccurate" post is not a post that should be marked as Unhelpful. If you recognize that the information is inaccurate, post the correct information. A disputive post is unhelpful, and can be reported with the Alert function.
Topics/posts leading to a barrage of "in before the lock / IBTL" posts come to mind.
When posted information is inaccurate, hopefully it is alerted to the mods or, if others point it out to the OP, the OP adjusts/deletes the misinformation.