I messaged him and said:
Hello! Interactive Fiction enthusiasts are interested in preserving your games on the IFarchive. The malinche games, including Pentari, have come up in discussions before, and people have expressed dismay at not having that part of historical heritage available.
Would you consent to your games being archived to the IFarchive? One user possesses them, but refuses to upload them without your permission.
(it looks like the phrasing on my last point was off, but that’s what I thought at the time I sent it, and I intend it in a favorable way, like an honorable refusal).