True. It looks like the last PPC Macs were released in 2005 and were available through 2006 [1]. The last OS that supported them was Leopard, which got Security updates though 2009 [2].

[1] https://everymac.com/systems/by_timeline/ultimate-mac-timeli...

[2] https://en.wikipedia.org/wiki/Mac_OS_X_Leopard#Release_histo...