You know, as someone who's cranked out more than a few century+ days on bikes, as long as your stomachs OK with it that doesn't sound terrible.

It's got carbs, proteins, and fats, which will all metabolize into energy at different rates Presumably rather a lot of salt too is in bar pizza.

Wins all around I say. I'd personally be a bit wary of food like that were it me, but proof is in the mileage I guess.