I would be very cautious about buying from that site, it is completely devoid of any contact/address information other than the rather retro "contact us" form - but they appear to have a functional cart system, so would be happy to take your money.
Their testing methodology leaves a lot to be desired in that they only capacity test a sample (yet state elsewhere that the remaining capacity will be at a minimum of 85%)
They appear to be associating themselves with the Fully Charged 2019 expo - I suspect they are simply visiting that event on Friday - they are not exhibiting.
Given the condition of the Fluke shown on the testing page I suspect this site is the work of an individual, or small traditional garage or vehicle breaker who have come across a scraped EV and wish to sell the battery.
But these are good cells, assuming the usable capacity and price suits your application.
