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I would agree that it’s most certainly HDR. You can tell by the range of exposure he’s / she’s getting with a single image.
For example, if you look in the stained glass window underneath the mezzanine slightly to the left-center – you can see a bit of green foliage in the bottom pane. Note the extreme brightness of the foliage, but still, it’s clearly visible.
Now, if you look at either the the left end of the pews directly in front of the camera or perhaps the top nooks of the archways by the organ – you can still make out plenty of detail and contrast even though these would normally be the *darkest* areas of the photo, given where the light is coming in from the window. In my experience as a [very] amateur photographer, it’s near impossible to achieve this range of exposure (extreme bright and extreme dark) without either HDR or some really skillful photoshopping.
In addition, the entire room appears to be uniformly lit without the use of a flash, which can be achieved by subtle (and skillful) HDR. The photographer was very good in achieving nice exposure without going overboard.