Dehaze has never been a part of Lightroom standalone version 6.
It is only available in CC2015 version, that is, for subscribers.
so its not in 6.5 it said it was part of the program.
No, it is not there in 6.5 and it was not there is earlier versions of Lightroom 6 as well.
What said it was part of the program? The dehaze filter has never been part of Lightroom 6. It's only in Lightroom CC, the creative cloud subscription plan.