This book says it is Language Type Greek but it appears to be German or Dutch inside.
RAHLFS, ALFRED (ed.), Supplementum (Vetus Testamentum Graecum. Auctoritate Academiae Scientiarum Gottingensis editum; Göttingen 2004) I, 1.
The language is indeed German.
Thanks for confirming @NB.Mick. Hopefully someone will change the language type to German in the library.
I have opened a ticket for this issue.
Thank you @Joe McCune (Faithlife).
