Based on what we've seen in the past, we usually say info coming from customer reps shouldn't be taken as the final word. But with so many of them confirming Oreo for the Galaxy S6, it does seem the update will be arriving.
I do not doubt that Android Oreo is being tested on the Galaxy S6 family. But as on other occasions, it is quite possible that this update will be disapproved for obvious reasons.
Android 7.1.2 for Samsung is that neither Android 2.3.7 was in 2011. And who received the Nougat, received! Independently whether it is 7.0 or 7.1.1, or whether it is SE 8.0, 8.1 or 8.5. Now just wait for the Oreo to be distributed in the second ...
and my s6 didn't even get nougat