I watched Austin Evans' video on it and it boiled down to the diction DK Oldies was using, specifically the word "refurbished", which indicates a more cleaned out/up product. Dusting, redo-ing the thermal paste (I know my original XBOX could use a repaste!), stuff like this is essential to calling it a "refurbished product".
OP made a comment that "I don't think the DK Oldies customer base gives a damn about dust inside of a console they don't even know how to open up, they're not the hardcore techy type of customer base.". Not to be that guy, but I do.
For those not as involved with computer and console hardware, thermal paste is a necessary goop that fills in the imperfections between the surface of a heatsink and your console's CPU/GPU/onboard whatever. This is vital to cooling and certainly make a difference. Remember, unless it has been changed before your paste is as old as the console!
I understand this may come off as nit-picking, but if you're going to list a device as refurbished you need to actually put in the work that makes it "refurbished". The outside of DK Oldies consoles admittedly look pretty good, but the inside looks like my gaming keyboard.
Out of respect for the VGCollect community, I honestly can't recommend buying from DK Oldies given the price to quality ratio we are seeing. Check ebay, offerup, craigslist, local yard sales etc.