I would agree that a person may be sued for civil damages by someone harmed by the wrongful conduct for which they were pardoned.
A pardon also does not relieve a party of civil contempt sanctions (i.e. contempt sanctions that can be terminated upon compliance by the person held in contempt of court with a court order) even though it may relieve a party of criminal contempt sanctions (a court imposed punishment for disrespectful conduct in the presence of a judge or a court sanction for violating a court order that cannot be purged by compliance with the court order).
I would not agree that statement regarding admission of guilt in Burdick v. United States, 236 U.S. 79 (1915) (cited in the answer linked in the question) is still good law on that point, at least in most common law jurisdictions. This is probably best regarded a non-binding dicta rather than a binding precedent.
The majority modern position is that a grant of clemency is not dependent upon being accepted by the person to whom it is granted. See, e.g., Haugen v. Kitzhaber, 306 P.3d 592, 599 (Or. 2013).
Even to the extent it involves an imputation of guilt, it does not have "collateral estoppel" effect because it is not based upon litigation resolved on the basis of facts and evidence presented to a tribunal.
And. since a pardon is generally granted by a person without personal knowledge of the facts, it is also not relevant evidence of whether the act was committed or not.
A Presidential pardon also does not bar ethics board sanctions for the same underlying conduct as the conduct pardoned.
Disciplinary proceedings were instituted against attorney. The Court
of Appeals ruled that sanctions could not be imposed on attorney
following presidential pardon for underlying conduct, 662 A.2d 867,
and rehearing en banc was granted. The Court of Appeals, Schwelb, J.,
held that: (1) presidential pardon setting aside attorney's
convictions on charges arising from his false testimony to three
congressional committees did not nullify Court of Appeals' authority
to impose professional discipline, and (2) attorney's conduct
warranted public censure.
In re Abrams, 689 A.2d 6 (D.C. App. 1997) (official synopsis).
Some of the confusion arises from the fact that a pardon of someone who has been convicted of a crime does not itself mean that a person was not guilty, something that is conclusively presumed following a conviction, and moots litigation to overturn the conviction that has been pardoned, thus preventing a court exoneration of the judicial guilt determination.