Seeing the picture it looks just fine to someone who doesn't know much about wiring. To someone who does the glaring issues are as plain as day.
The red wires (some versions use other colors) look to be #16 or #18 are coming directly from the battery sled going straight to the switch, off the switch it goes to the board, then power goes
through the board, gets converted and leaves at other end of the board going to the 510,
through the atty, back from the 510 (now black) to the board and from the board back to the sled completing the loop. As pictured the switch is carrying 100% of the load, there's no question.
The wiring is technically OK, but the circuit design is absolute garbage.
Knowing that I was still close to pulling the trigger on one of these things, because I could fix the switching and add low voltage cut off with ease, but then I thought about the DC-DC converter for a second. Considering the circuit is designed for premature failure, there's no chance at all that they'd put in an actual 150W converter, rather than a much lower rated board being pushed way over specification. All that leads to one conclusion, these are price point build
devices intentionally built to fail, or more appropriately are built to a price point made to last just long enough to make it through the warranty period.
Out of the box, these things will deliver, they sure as hell aren't designed to last much longer than they absolutely have to though.