Forget the “SPI” nomenclature in those ads, it has no connection to the industry standard meaning for multi device communication.
The WS2805 type LEDs have standard D(ata)In, and B(ackup)In data lines.
The recommended wiring is to ground the BIn line for the 1st LED and supply data to DIn as you would for typical WS281x devices.
You’ll have to have a more recent version of WLED to support that protocol.
I think you need to get up to V 0.15.xxx(?)