You are not understanding the distinction between
divisions and
leaguesCanada currently has 139 active teams, or enough to fill 8.69 leagues. That is 1.1, the 4 leagues in D.II and most of 4 leagues in D.III (III.1, III.2, III.3, and III.4). There are no active teams in D.IV.
BB has disabled pro/rel between divisions that are
totally inactive. This was specifically confirmed by the BB when I started playing. In the USA, pro/rel is disabled between D.IV and D.V. In Canada it is disabled between D.III and D.IV.
But between divisions with at least some active teams pro/rel is executed just like normal, even if it means, as in your case that a team is relegated to an all-bot
league in D.III.
As a special note, when a bot is promoted from D.III to D.II (by winning their league championship) they are immediately relegated as part of the bot cleanup. For example, the bot
(25084) that won III.13 in Season 2 and replaced your team was immediately dropped in III.3 where they were given a new owner.