Trump's influencers work around that in a different way: by singling out individuals for military tribunals[1], he is not using the pardon power to deprive them of due process, or excuse someone else from doing so. The military tribunal deprives them of due process. But trying a civilian in a military tribunal is only constitutional if a civilian court is unavailable, which happens out of convenience in places like Guantanemo Bay.

[1] nytimes, https://archive.ph/fz52u