Yes, of course. It says - ball grid (array) in the article. Doing it by hand, e.g. with just hot air is proper hard. It's not hard with specialized equipment (that cost way more than the laptop, itself). Sourcing the chips is not easy either.
As for the videos and the Macs, you can see the same people (likely) soldering RAM as well.
As for the videos and the Macs, you can see the same people (likely) soldering RAM as well.