What you saw was probably from PKK sources. I understand that you don't wanna argue further but i'm gonna say a few things.
These soldiers have families, friends, neighbours etc.... It looks for just a post on facebook or twitter and all the hell would break lose if it's understood that government hides the numbers.....in which government should make the army to it's complicit. No government can take those risks.
In 30 years of clash with PKK, i have heard no one saying "My son have been martyred but government hided it."