No, clicking through this thread and the big threads [1] [2] in the past 5 days, commenters mentioning "Brother laser" have much more than 100,000 combined karma and most of the accounts are 3+ years old.
With a history like Brother's, and awful competitors like HP and Canon inkjets, you too can get free, genuine endorsements in the form of raving comments for your brand on HN.
I'd also happily endorse my Fluke multimeter, or my Mitutoyo digital calipers, or my Wiha screwdriver set. If you make great products that people like to use, people will leave positive feedback for you. This kind of endorsement is exactly what shills are trying to copy, so it does look similar.
Disclaimer: I'm yet another happy Brother owner. I love my 2380DW, which I recently bought to replace my first Brother laser (I forget the model number) that had served me well for more than a decade. That's in sharp contrast to the crappy HP inkjet I bought my first year of college, which lasted less than one semester, and my wife's several inkjets through her college days (now, obviously, she uses the Brother laser) and my parent's various inkjet struggles. Some 5 years ago, I set them up with a 2730DW, and the first service I've had to do for them was to change the wifi password a few months ago when they changed ISPs.
[1] https://news.ycombinator.com/item?id=25008894
[2] https://news.ycombinator.com/item?id=24977699