I managed to find the "academy " link you were referring to:
I went to https://www.lingq.com/en/academy/, and it looks pretty old. It’s probably just a part of the older LingQ system, and that’s why everything seemed outdated.
The LingQ support team can correct me if I’m mistaken, but the Knowledge Base category/section seems to be the newer and more updated place for info on how to use LingQ: