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I think you are misreading what they say. They are not saying RT reporting is credible, they are saying that EU's court ruling makes objective truth not a valid defense from prosecution.
The ultra-Orwellian move makes no distinction whether what the video says is true. It makes no exemption for journalists.
If <insert your trusted reporter> reposts the video to criticise it for all the lies they are commiting a criminal offense under this ruling.