Quoted from surfajl77:» YouTube video
No idea what he is saying, but he's obviously doing some kind of insert comparison. And they both look pretty good if you ask me. Although after looking through his other videos, I think they're examples of his playfield restoration work - so that isn't really a fair example.
He's comparing his restored playfield (on the left) with an original playfield (on the right) regarding insert text opacity. He's basically saying that his restored playfield text is much more opaque than on the original.