Wow, that is interesting!
It's difficult to see the model name on the image-- and yes, I realize the model name is given in the ad-- but if the image actually does go with the ad then it's a Yamaha keyboard, and seems to be virtually identical with the recent models in the PSR-E400 series, so it might be some sort of regional version from that series, similar to the way the PSR-I425 and PSR-I455 are Indian versions of the PSR-E403 and PSR-E433, respectively.
However, I found another ad on a different site that shows different images of the keyboard:
That second keyboard isn't a Yamaha, but instead is a Martens keyboard, in which case it would presumably be unable to use the Yamaha USB-MIDI driver.
Going back to the first ad, not only does the image show a Yamaha, but the description of the specs says that it's a Yamaha, and the listed features seem to be comparable to the latest models, the PSR-E453 and PSR-E463. In fact, the model number in the image is too blurry to make out but looks like it might be 483 or 463-- the last digit looks like a 3 whereas the middle digit does not look like a 3. But if it's a brand new model from Yamaha then the image might not be of the correct model, such as if the retailer didn't have a picture of the correct model.
On the other hand, the retailer might have put up the wrong image and description by mistake, due to the model's similar name to a PSR-E463, so it might be a Martens PSR-S438 with the wrong image and description shown.
If it really is a Yamaha, and if the listed specs are correct, then I'd guess it includes built-in USB audio, just as the PSR-E453 and PSR-E463 do, in which case it requires the Steinberg USB driver, not the Yamaha USB-MIDI driver. (Steinberg is owned by Yamaha.)
But if it's the Martens PSR-S438, then it probably won't work with either of those two drivers, and either it doesn't require a driver because it's class-compliant, or it requires a proprietary driver from Martens.