You're right, the camera was in front of the actual finish line.
My point is that Wout was ahead for the /entire/ duration where the front wheel intersected the camera line. The wheel's diameter is bigger than 20cm, so the moment when Wout passed the actual finish line is included in this interval. Therefore, Wout was ahead when the winner passed the actual finish line. QED.
If there was an overtake -during- the moment of the photo finish then one bicycle would eclipse the other. The overtaken cycle would be entirely longer than the overtaking bicycle.
Line judges go for wheel contact, so for an overtaking to count, the -front wheel- of the overtaking rider would have to be fully within the front wheel of the other.
My point is that Wout was ahead for the /entire/ duration where the front wheel intersected the camera line. The wheel's diameter is bigger than 20cm, so the moment when Wout passed the actual finish line is included in this interval. Therefore, Wout was ahead when the winner passed the actual finish line. QED.