TBH I think their scoring is more indicative of blatant favouritism and politics as opposed to standard reputation judging. New faces get gifts if they come from the right place while others have been prevalent for years and still get hosed. I agree with the rest of what you're saying. Though I wish reputation judging wasn't a thing at all.
To be fair, that kind of political boost is also a thing in international competitions. Maybe not as blatant, but it's there. Skaters from big feds often get a bit of a boost compared to small fed skaters, but that pales in comparison to the boost top skaters get - Regardless of country.
It would be quite interesting to see how a mid-field skater was scored internationally before and after switching from a big to a small fed, but I'm blanking on skaters who did that and kept their performance level, at least before the ban. Gubanova switched before the ban, and I guess she scored similarly enough (ISU SB 198.65 in 2018/19 and 203.91 in 2021/22). She made a few more errors at 2018 Golden Spin, so it makes sense for that score to be a bit lower, but the SP scores were practically identical.
Reputation judging isn't great, but it exists, in one way or the other. It's not smart to ignore it, especially when trying to make sweeping statements (a la "All skaters from country X" are underscored or "All skaters from country Y are overscored."), because that often ignores the reality of the situation of some skaters. Someone like Sonja is not going to be treated the same as someone like Isabeau, even though they are from the same country.
The reality is also that it's a positive bias, mostly, even if people tend to focus more on perceived negative biases (that are usually born out of someone else being treated favourably). The end result is the same, of course, but there's just a difference between overscoring and underscoring. The motivation for actual underscoring feels far more sinister than for overscoring, which is sometimes even just the result of very strategically placed jumps (the tech panel camera is not the broadcast replay camera).