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Just how did you embed?
hxxp://www.youtube.com/watch?v=-kYFsP_q9V8&feature=feedu
-kYFsP_q9V8
Some of the scratches on the film aren't what they seem. Vertical scratches on old footage are created "by the contact of the film material running against a mechanical part of the camera or film projector".
It's hard to imagine a mechanical process that would create a "dotted line" scratch across several frames, that happens to only hit the digit area. But it's easy to see how this artifact can be accidentally created in digital post-production.
The author probably wanted to apply some extra fuzz on the numbers so that they almost disappear at times. So in addition to the full frame aging effect, they've defined another filter that only affects the numbers. That's why some of the scratches are limited to that area.
This would also explain why the quality of the digit display varies uniformly (all digits equal brightness/blurriness), but independently from the rest of the frame. It's hard to come up with an alternative, "natural" explanation.