Update: Ebay Seller Y-wait69:
https://www.ebay.com/itm/Electric-High-Pressure-High-Pressure-30MPa-Air-Compressor-Pump-Rifle-YONG-HENG/283535786954 definitely a clone. The unit is on the way back to them on their dime, eBay was notified they are fake. The seller then changed the ad slightly and removed the pictures with Yong Heng on the side of the unit, but keep the YH name in the title, main picture and description.
For $10 more, $245,shipped plus tax, I got an authentic unit from seller: HOMESUPPLIES01: It was on my doorstep in under 48 hours.
https://www.ebay.com/itm/YONG-HENG-30MPA-4500PSI-High-Pressure-Air-Compressor-PCP-Airgun-Scuba-Air-Pump/353126179430?epid=18021956253 Authentic specification plate and manual from the second legit unit. Neither mentioned Yong Heng (which by the way, in Chinese means "eternal") on the cloned version: