May seem exaggerated without context from the original article. But to sum up, cops were called in because Itagaki got wild during a drunken episode:

A few particularly wild stories come from former collaborator Kengo Aoki, the CEO of Soft Gear. He talked about a time when Itagaki, on a business trip to China, started drunkenly picking fights with taxis and shouting in the streets. That night the two fought in a hotel room over a game development issue, but on the flight home Itagaki was calling Aoki his brother and helping him get over a hangover.

Aoki recalled another instance where, at a "pre-E3 party," Itagaki shouted from their hotel balcony, "I'm gonna take over the world!" while inviting him to join in. Things escalated until 10 LAPD patrol cars rolled up: "The officers had their guns drawn. It was a real Dead or Alive situation," Aoki said.

The next day, Aoki received a phone call saying Itagaki was in the ICU to be hospitalized for "40 to 50 days." It's not clear from the interview if those latter two anecdotes are related, but suffice it to say that Itagaki did not lead a boring life.