Recent archaeological evidence suggests that Iron was used as weapons by south indians as early as 2200 BC which is almost a thousand years older than Hittites and other civilisations! There is also evidence that military elite Mitanni migrated from east to northern Iraq in 2nd millenium BC and entered agreement with Hittites in 1380 BC where Vedic Gods were invoked to solemnize the treaty. Is it possible these people intoduced iron tech?
In a word, no. Iron-working is attested as early as the 3rd millennium BCE in Anatolia. I wrote about this in To what extent did the Hittites make use of iron?