I was the one answering you, I GUESS that the publishing score impacts on your visibility because when you read on the "rules to get on top trending models" it says that it includes ratings, popularity, sales... etc and publishing score is very probably included in it because it's a major factor.
But I may be wrong, so if anyone have the ultimate answer you ll be welcome :)
And yes the fact that 3D printable models impact on publishing score is unacceptable because it can't have the same number of formats/renderings as a cg model :/