Yes, it is the OFFICIAL version
Here is the first page:
You can find out more on this reddit post, including email with one of the people who works on the official comic and a preview of a part of the script.
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WHAT
The day of prophecy has come to pass. All TF2 players please report to your nearest mountain so you may ascend.
Very apt of them to start off by showing the TF2 community after waiting so long for an update
HL3 enjoyers
THERE CAN BE MIRACLES! WHEN YOU BELIEVE!
poggers
Oh, wow, at this point, I had been waiting for this more than for something like HL3
Holy shit
