They also contain some loanwords from the local language of Kanesh (Kaneš, Kültepe 'ash hill' in Turkish), which is the earliest record of any Indo-European language:
The Kanisite Hittite that the GP describes isn't the Hittite taught in textbooks. It is a handful of Indo-European names in otherwise non-Indo-European text. For specialists only.
I am aware. But the fragments of Hittite attested in these Old Babylonian texts predate the earliest bits of the extant Hittite corpus by about a century. Given what we know about how the Hittite language evolved when it is well-attested, the differences are unlikely to be substantial.
My point remains: If you want to study the earliest attested Indo-European language, there's a good freshman-level grammar out there.
https://en.wikipedia.org/wiki/Akkadian_language#Dialects
They also contain some loanwords from the local language of Kanesh (Kaneš, Kültepe 'ash hill' in Turkish), which is the earliest record of any Indo-European language:
https://en.wikipedia.org/wiki/K%C3%BCltepe