Except it's not a low-profile card. Looking on PCPartPicker, every 1650 that's available right now is a full-width card. There is apparently one low-profile Zotac 1650, but it's not stocked by any US retailers tracked by PCPartPicker at this time...
https://pcpartpicker.com/products/video-card/#c=443&sort=price&page=1
Further, a majority of them DO require external power, including the one tested for this review, and the ones that don't tend to perform a little slower.
That's not to say the card is useless though, and for someone looking for a budget card for a pre-built system with something like a 350 watt PSU, it could make sense (provided they are not trying to fit it in a slim case).