Though sometimes people confess due to interrogation pressure tactics, there is still this phenomenon that the article doesn't touch on: attention-seekers who voluntarily call in and turn themselves in, claiming to be the perpetrator of some widely publicized crime, like a serial killing or whatever.
There is a fair amount of press in the UK at the moment related to a Westminster VIP paedophile ring where it looks like the "victim", a Carl Beech, may have been making it up.
