So I went to HorseTelex. From what I can tell (and I am not an expert, but love to search stuff like this), the dam, Ilona (a KWPN), had two foals that year 2004 from Quinar. One named Quinny (no Z on that one) and another by the name of Quiny Z. Both registered Zangershide. Maybe one was by embryo transfer?
The Quinny one has a record to 1.35 (according to Horse Telex). The Quiny Z had foals in 2021 (McSteamy) and 2023 (Fins Up) but no record next to her name. (They usually only post notable performances like above 1.30.)
So who know if anything we are reading is correct on that horse, other than she is bred well.