What these folks do is essentially bulk-import cheap laptops from the USA, UAE, Singapore or Hong Kong to your country, and bump it by around 50 to 100$ to make a profit out of it.
Try looking for trusted international shipping options from Singapore or Hong Kong, because this price is pretty expensive for a almost six-year old laptop - you should be looking at 280$, at max for a 8th gen processor.
If you can wait, have a relative in the US get a slightly modern model for cheap through them, this way you don’t have to pay shipping, insurance and customs.
And just a word of warning - please verify the laptop model using it’s serial number. Check carefully if there are any discrepancies.