Unless I’m missing something, the discussion on that thread looks quite definitive to me. I’ve just setup and tested a DDP configuration (for the first time) of multiple WiFi bulbs – albeit using DIY ESP8266 WiFi bulbs rather than athom bulbs; each bulb with a unique IP address; each bulb getting treated as an individual addressable LED of the same strip.
Where exactly are you getting lost? IP config? Led output config? Segments config?
Gbd.