Yes, I can see that it’s a technical violation of the policy. On the other hand, OP explicitly abandoned the channel and then cried “abuse” when the administrator stepped in to resuscitate it. And now this very tiny tempest in a teapot is at the top of HN for us all to gawk at.
It's like you had mysite.com, decided to rename it to a new domain and so put a redirect. And then the CEO of the DNS authority decided to take your domain for himself, put a copy of your previous site on it and pretended that you never moved it in the first place.
It’s nothing like that. If you want a modern analogy, it’s like the moderators of a subreddit abandoning it, and the reddit admins deciding to keep it going anyway. It violates the expected wall between moderators and admins, but it’s hardly theft or impersonation.
But the reddit admins never take away channels like this. For an abandoned subreddit to be took away, it needs _time_. Just like on freenode (where the registration would eventually expire with the expiration of OP's nick). There, rasengan abused his services power to alter the registration without any respect of freenode' policies.
And he's justifying this as "spamming". Because OP's said in the topic of HIS channel that the channel moved to libera.
Of course, when you run the network, you can do what you want. But then, that's the point of the move.