Nah, Pep has always been a ride or die dude. He'll never park the bus whether he's 5 up, or 3 down, this is not his philosophy.
You say Japan should have parked the bus because they felt inferior... but they were 2 up in the second half ! Belgium managed to tie the game but when Honda came on, Japan had chances to make it 3-2. And Honda even had a dangerous FK at the 92'. It's easy to rewrite things with hindsight but even though Japan was a bit naive, they definitely could have won this. The last 10 minutes was like 2 boxers swinging wild for the KO in the 12th round. So obviously both formation were very unbalanced because they were going for the kill (let's not forget the huge spaces behind Belgium's WBs). Japan just got Taylor-Cesar Chavez'd, this happens.