I don't buy this story as written. It's totally unimaginable that a random dude in a Volkswagen (identifiable by everyone as a foreigner) would gather useful intelligence by making outside photos of random buildings; nobody would let a Volkswagen near anything resembling a military object. As Makinen is quoted himself, there is more to the story.
The only weirder story I know of is the one of Mathias Rust (https://en.wikipedia.org/wiki/Mathias_Rust) .