He didn't get 20 years, that's just the maximum permitted penalty for the crime he committed. The article title cites it as clickbait.
It's rather irritating. The law was made with a flexible range of punishments to permit the judge of any particular case to use discretion when determining an appropriate punishment. The maximum permitted is thus rather high. So now every article written about the subject lazily cites "up to 20 years", and thus everyone reading those articles gets the impression that he's actually likely to get 20 years for this incident.
It's rather irritating. The law was made with a flexible range of punishments to permit the judge of any particular case to use discretion when determining an appropriate punishment. The maximum permitted is thus rather high. So now every article written about the subject lazily cites "up to 20 years", and thus everyone reading those articles gets the impression that he's actually likely to get 20 years for this incident.