Found it mate, cheers anyway. Can't remember, maybe the outrageous pass I was thinking off was given as offside, makes sense.
Assume they don't count a chipped ball as a through pass then?
I was looking at the key passes earlier.
Here's their glossary:
http://www.whoscored.com/Glossary
tbh I think it's a bit of a grey area. I would think that there wouldn't be a distinction between a chipped pass and a ground pass in terms of a throughball if it beats the defensive line.
I was watching a video on youtube about their methodology. They have 10-15 people watching the same match and each one of them would be recording particular stats. So I'm guessing through pass would be a subjective claim (no doubt guided by the glossary) just as it would be if you and I were counting.
Anyway, the thing to keep in mind is that statistics don't lie. They're just recording actions that happen in real life into numbers so you can aggregate them over a large enough sample and draw conclusions. How one interprets them is another issue altogether.