That’s not settled law. From your own link (emphasis mine):

Although the Supreme Court's opinion stated that a pardon carries "an imputation of guilt and acceptance of a confession of it,"[2] this was part of the Court's dictum for the case.[4] Whether the acceptance of a pardon constitutes an admission of guilt by the recipient is disputed.

To be fair, it would be normal for trump. He's done worse and got away with it.