When videos end, you get a changed layout thing. More videos are displayed now. Why didn't I notice until now?
Didn't you? Kill yourself. Well, I myself found out this when I was 7, the first time I got the pc and youtube. xD
He's referring to the change YT made recently. Instead of one or two videos suggestions per page. Now the whole video screen changes to little squares of suggestions. Like easily 10+ of them. Of course everyone with half a brain knows YT shows related videos when said video ends.