A quick search shows that NPR and the New York Times both covered this aspect of Mr. Grosskreutz' testimony. Covering additional details from the testimony is not lying.
More importantly, focusing narrowly on that fact detracts from the fact that Mr. Rittenhouse had already shot and killed two other people that night. Mr. Grosskreutz' pointing of his gun, whether intentional or not, is not what turned Mr. Rittenhouse into a killer.