Hello Sam,
I corresponded with a fine young fellow who is writing a doctorate on the Chida and asked him whether he thought the Chida’s hesitations about the sefer Adam V’chava were because of the poor copying, or because there is nistar in the typos and people who are spiritually unworthy should not be using it.
Naturally, he was very familiar with all of the Chida’s writings, and mentioned the Chida’s affinity for Rabeinu Yerucham’s Adam V’chava.
He is convinced that the Chida’s comments on the copying accuracy of Adam V’chava are all in the nigleh (as you said yourself), and he saw no evidence of typo = nistar. The Chida was wont to warn people about poor copying standards, and he especially emphasized this in the writings of Rabeinu Yerucham, which were to him, loaded with mistakes. Bottom line, the Chida valued greatly the writings of Rabeinu Yerucham provided that one use extreme caution.
If you want, I’ll copy-paste his comments to me.
As to the discussion, I have no doubt that the “gimel sha’ot” is a typo, and that this typo was not the source or even an asmachta to the German minhag.