That N64 model makes no logical sense given the power supply is attached to the console, and this doesn't provide any space savings. It's not even cheaper than an N64 power supply.
Hyperkin has announced power kits for retro consoles and classic handhelds. The kits, which replace the old and bulky power supply, include compact USB-C power adapters, Type-C cables, and connectors/adapters for each device.