I don’t know if I’m blind, but I’m not seeing too many holes?

Are you looking at the full sized pictures or the shrunk ones? Here's just one with the holes see circled in red:

It was WW2. WWI planes did not get armour. They were made typically of wood and canvas and used engines with the same output as a moped. Also, the example you provide is for planes that were hit in mid flight and lived to RTB for examination. This helicopter was hit on the ground and abandoned. Assuming any of the holes aren't catastrophic would be a dire mistake.

The survival bias diagram you usually see for this is not necessarily for a single plane but for a number of them and aggregated into the diagram you’re familiar with.