This video is fair use under U.S. copyright law because it is transformative in nature, uses no more of the original than necessary and has no negative effect on the market for the original work. Furthermore, this video is protected speech as outlined by the first amendment of The United States Constitution
Boney McBonerton currently has 2,498 views spread across 29 videos for Half-Life 2. There's close to 14 hours worth of content for Half-Life 2 published on his channel, or 1.17% of the total watchable video on Boney McBonerton's YouTube channel.