Is this offhand? They never say.
Does it matter?
If that's where it hits with them shooting it, then that's where it hits with them shooting it.
My P95 shoots about four inches low and slightly left at 7-10 yards with my preferred handload, in my hands. Put it in my brother's hands, and it puts the same load a bit right and only slightly low.
Same sights. Same load. Same gun. Same shooting method (rested, standing, sitting, whatever...). Different results.
The difference is that I use a 6 o'clock hold with fixed-sight handguns, while my brother uses a bullseye hold. I was never taught or trained that way. I don't know why I do it (possibly since fixed sights are often wider?). Yet, I use a bullseye hold with adjustable sight handguns. It's just what I do; and, even though I recently identified the habit and recognize that it is less than ideal, I have no plans to put effort into breaking it.
Now, if you are referring to attempting to compare relative or potential accuracy across several models of handgun or several examples of the same handgun, then I do see some point in the discussion. It does matter, with the average shooter (including myself), whether or not the pistol was rested (and how).
For the record, I rarely rest a handgun in any way. Thinking back... I believe it's been at least five years since I tested a handgun with any kind of rest.
I shoot off-hand. I might as well test off-hand.