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I have checked the Hungarian sources that are available online (3 or 4 of them if we don't include duplicates and pages that just mention his name). The most detailed one, a scholarly paper about Moses and his brothers, can be found here. All Hungarian-language sources agree that a Polish woman, the widow of a high-ranking Polish officer who had died in the expedition, fell in love with Moses and tried to force him to marry her using various means, including torture. The only one that actually claims Moses was emasculated (with the alleged justification "if I cannot make love with him, no one else shall") is a translation of an article in Russian in an online journal dealing with homosexuality-related topics ([2]) but it does not cite its sources and seems to mix facts with legend throughout the text.
The two scholarly works (the one cited in the article and the one mentioned above) do however refer to other sources that could shed some light on the topic but are only available from libraries I don't have access to. Also, I'd guess that more sources are available in Russian or Ukrainian than in Hungarian, but unfortunately I don't read these languages – editors who do could possibly help.