Apple hasn't crippled Logic9 so it won't work on a G5, and it's still a Universal Binary (this means: works on Intel and PPC chips). It just isn't supported or recommended. Use at your own risk. Wear safety goggles and have a fire extinguisher handy! Sign your organ donor card! Finish your bucket list!
I finally got to install mine on my Macbook Pro. I then proceeded to 'research' the installer requirements and nowhere I saw or detected an 'Intel' only path. This, in addition to all components being Universal binaries, clears the prolonging G5 systems a while longer.
It's time to start saving though... the writing is on the wall.