The article linked here addresses that multiple times. That accusation, largely overinflated by the media, was dismissed with prejudice. He was never even charged with it.
The article conflates the case in Maryland, which was dismissed after Ulbricht was already convicted and his appeals denied by SCOTUS.
The article pretends this exonerated Ross when it reality the government didn't see a reason to go through another trial when he was already serving multiple life sentences.
The article also does the hand-waivey "it was never shown the messages were authored by Ross."
Those messages were presented into evidence, during the trial. Ross lawyers had no explanation for them.
The FBI accepted that multiple people were behind the DreadPirateRoberts account and that the writing style did not match his. He was ultimately not charged with it, but the story was used to slander him and make him seem dangerous and violent.
The article pretends this exonerated Ross when it reality the government didn't see a reason to go through another trial when he was already serving multiple life sentences.
The article also does the hand-waivey "it was never shown the messages were authored by Ross."
Those messages were presented into evidence, during the trial. Ross lawyers had no explanation for them.