The car almost certainly decided that the road ahead was blocked. For context, this release of FSD is the first to use a new obstacle detection technique, and as a result it is the first one that doesn't drive directly into the pillars on that street without perceiving them at all. So it's very likely that this new obstacle detection system glitched out here.
The guy in the video is intentionally stress testing the system by repeatedly driving in an area he knows is poorly handled. But it's totally fair IMO, this is a real road and while it confuses humans too (as evidenced by all the people here claiming that it's illegal to turn right here), FSD must handle it better than this.
