It was never confirmed that it was him.

Ok, here we go... Praedyth was said to be "skipped through the time stream like a stone" or something like that in the Praedyth's Timepiece Pulse Rifle. If he was warped out of time or "wiped" out of our time, why would his bones be here. He probably died in our time but his comm is from another timeline and the exo strange works for him. They are fighting the "Exo vs. Vex war..." aka the "Eternal war." also to put this info in too: The time's vengeance in the Atheon's fight is said to be all of the guardians from the different timelines shooting him at the same time. That's why it is called time's vengeance. Every guardian that has been taken by time and the vex, as well as the guardians in other timelines. Thats why we get warped into time during the Vault of Glass fight. I know, VOG=Illuminati but, if you look into the lore, it makes more sense and is really interesting. In paradox, we get warped into a whole nother timeline, thus getting communication from the LIVING Praedyth. (He skipped like a stone in time's ocean...." He skipped, as in touched many timelines and is currently trapped in them.

The mission is called "Paradox" imo Praedyth died in our timeline, but also is still alive in another dimension outside of time. For him, he hasn't died yet.

I was under the impression that was a body from the original fireteam but not praedyth. Remember in VOG we receive kabyrs armor. Praedyth only gives his weapons. The body we find is nothing but bones. And since we know praedyth is alive but displaced in an alternate dimension I always assumed that was kabyrs armorless body