No, but it's a great source to get stuff if they can get the parts, and all their tools should work well. If their batteries aren't OEM ones, they won't try to pass them off as such.

I've been fixing cell phones since the 90's, along with a lot of other electronics, so most of my equipment has been a hodge-podge of sources I've collected over the past 25 or so years.

In the case of the battery I just got for my N20 Ultra, there is no source I could come up with that sold in the US and also seemed verifiable or completely trustworthy so I had to take a risk and order through a supplier off ebay. The pictures looked legit and like what I know the oem's look like, and they had the correct looking adhesive and protective coverings on the batt, plus I messaged the seller back and fourth a couple of times and they stayed on their claim they had new oem batts, even after I'd mentioned I would capacity test the battery and leave them a review.

Now, I still won't know for sure for a few more days. I'll drain the batt to phone shut off and then charge to 100% plus 2 more hours a couple times, and then drain to shut off and charge it to 100% + 2 hours one more time while leaving the phone off and using my in line voltage/mah tester. Knock off batteries never get very close to an oem batts capacity.