Well what het is trying to do is implementing that the reported advertised an other server whilst in ambrosia's shoutbox.
There is an exception if they are clan-related or community(less). I couldn't find the shoutbox rules, but speaking from a server perspective, we aren't allowed to share links of other servers anywhere except pm where only 2 people may see it. (If he sent that to more people with an exact content and the link itself, that's a clear and obvious advert). I mean i also wouldn't like a non-ambrosia ip or server or community in the shoutbox where everybody can see. It would be more efficient and beneficent that u both should have shared this via steam or an other social network.
Now, about the morality and banality of this report (is really funny) to make topics about these kind of simple things. It would be also better to contact ur local forum moderator with rights to interact on the shoutbox to stop any links from being shared or showed to the public.
That's all i can overview here.