https://www.techpowerup.com/318126/maxsun-designs-a-geforce-rtx-4070-super-with-dual-8-pin-pcie-power-connectors
 
MAXSUN is an NVIDIA board partner focused on the Chinese domestic market. The company "innovated" a custom design GeForce RTX 4070 SUPER graphics card that breaks convention of a 12VHPWR power connector, and provides two regular 8-pin PCIe power connectors to draw power from. Although it's quite common to see custom RTX 4070 cards with single 8-pin PCIe power connectors due to its 200 W TGP, with the new RTX 4070 SUPER, NVIDIA increased the power limits, with the TGP now set at 220 W, which meant that nearly every board partner has had to implement the 12VHPWR connector, and include an NVIDIA designed adapter that converts two 8-pin PCIe to a 12VHPWR that's capable of 300 W continuous power delivery.

The MAXSUN card features an 8-pin native PCB design, it directly has the 8-pin connectors on the card, so there's no adapter included. China is a vastly compatibility-conscious market, and so such design choice go a long way to appeal to buyers. The presence of 8-pin PCIe connectors should particularly benefit case compatibility, where the connectors can tolerate much tighter cable bends than 12VHPWR, including with the NVIDIA-designed adapter.
 
I would assume this choice is tailored to the Chinese market.