I don't think they have anything useful to contribute. The PowerPC Notebook project has had prototypes in hand since Dec 2022, and bringup progress is essentially zero. It took them until July 2023 to realize they needed a JTAG debugger, and as of their last update in December, they still didn't have U-Boot working. At the rate they're going, a lot of the parts they used are likely to be discontinued before the computer is usable.