The video out ports were only used for the 30-pin video out, the main display never ran on them (could not run on them).
iPhoneOS kernel developers could hardly care less about the display; everything was done with the serial port and JTAG (I don’t recall whether Ethernet debug was ever supported).
There are a bunch of other errors / misconceptions in the article sadly. These boards were pretty cool & highly functional and it’s sad not to see justice done to them.