So it looks like you show on picture carry 5 wires to controller spliced to extend, because they were to short. Really easy job to open it up an redo splicing.
But for this you must have soldering iron, isolation stripper and heat gun of course.
With China brand ebike stuff is almost a must to have a electrical tools and electr knowledge before buying.
Of course don;t even try to ride in rain!! Everything exposed to elements.
E+ USA-made kits for example I own is a pleasure to assemble , watertight connectors, motor with thick wires sealed from rain, assembled with precision.
Day and night in terms of quality.