Why this russian troll is allowed here?

[Jellybean]

Blimey Philex, your post genuinely made me laugh out loud. If you check out his avatar and the following screenshot you will note that the “russsian troll” you refer to is the owner of the forum.

Is that why I can't block him and no longer see his posts?

Probably. But to circumvent the long established practice that members cannot block the administrator, you can apply for most favoured member status. But be aware, this is unusually granted only to members of at least five years standing. In the meantime, hang in there wingnut.