Joseph, you can’t have it both ways. Rav Goren actually held like you.
Rav Goren maintained that the geyrus for the principal in the Langer case could be revoked since he was not nizhar in halacha after the geyrus.
As a result, since the principal was still a goy (as you also maintain in the Trump case); Rav Goren, therefore, held that there was no mamzeirus.
I guess you, Rav Goren and other Poskim at the time employed similar logic in order to avoid mamzeirus in Yisroel.
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