The languages aren't even related. Hittite is an Indo-European language, closer related to English than Turkish
The current consensus is not that Hittite is Indo-European, it's that Anatolian languages (including Hittite) are related to Indo-European, both stemming from proto-Indo-Anatolian.
Kurdish is also Indo-European, but that doesn't stop Turks claiming it's just a dialect of Turkish (mountain Turkish).