Can you be a bit more specific, please.

The poster claimed that Mr. Assange is something like a russian spy tool. The link you provided is to a pretty generic "channel" on a website pretty much discrediet by most posters in this thread.

There should be something more tangible, and credible, for such an accusation.

I'd appreciate something more specific. Thanks.

All the original said in this regard was that RT employs Assange, which is a fairly uncontroversial factual statement.