This is not a general advice. Depending on the board, e.g. the presence of a CH34x USB to serial chip, this can be (and often is) a valid setting.
Klipper-for-MKS-Boards/MKS Robin Nano V2.x/generic-mks-robin-nano-v2.cfg at main · makerbase-mks/Klipper-for-MKS-Boards · GitHub should give you the required information to build the firmware for this board.
Of course, under the negligent assumption that Elegoo has not done something strange here again and the board is identical to the MKS Robin Nano variants.