If you watch Subaru Mike's follow up video where he puts the heads on the block, he states in the video that if you are using your USED OEM Subaru head bolts, you DO NOT have to do the first part of the funky tightening procedure, which GREATLY simplifies the procedure. He states that this is because bolts have already been stretched to spec when they were put on the first time.
I just did a 2.5i na motor and put the heads on using the same procedure he does here. It was no more complicated than putting the head studs on the turbo'd motor I did, and I was told by a tech at my local Subaru dealer that head studs have no advantage unless you are building a 300+ HP motor. Had I known all of this when building my OBXT motor, I would have saved the $ and re-used the OEM head bolts.
I believe if not mistaken that ARP advises that you pre-stretch their head studs as well by tightening them to torque, though it is easier than Subaru's stretch procedure.
I added a link to the video where he talks about the head bolts below: