They stayed very close to the original recordings so it makes sense to try to replicate the sound as best as they can, and if this can be done with JP guitars then do it. And when you take into account that Eric plays them regularly and the Haken guys have played them for some time, it's really no big deal.
And yes, it is a DT cover band, although I would have liked it probably more had they changed things a bit, rearrange some parts, play things a little bit different. The three singers were a step in that direction imo, sad that Daniel wasn't prepared and Ted was struggling with his voice.