If the mic in set to omni and compressed just right, it could have a lot of room sound on it. But the synth pad track and additional processing is masking what the original guitar and room sounded like.
Playing is cool. I think an IR for the reverb would have had the same quality. Only an audiophile with system capable of reproducing that detail (like a 192k or really hi-fi 15ips analog tape source) would appreciate the actual castle on the track.