If you have an account at thirdgen.org, he's pretty active on there.The website seems to concur with your statement.
I've reached out twice now with no reply. Someone here said that the guy running the show there is quick to reply. Seems that's not the case.
Tuning with the EBL - Third Generation F-Body Message Boards
DIY PROM - Tuning with the EBL - Hey can we start a thread for EBL tuning. The EBL thread is grown rather large and was pre release. All of us that are using the EBL could share our results and tweaks. RBob would have a place to vist on his own time and help those that need advice using his EBL...
www.thirdgen.org
Honestly with how much he posts and how in depth he goes to help people, I kind of feel bad for him lol dude is always working.
Realistically, do you NEED the EBL? No, you could scrounge around and find a stock PROM chip at a junkyard or on ebay pretty easily and if you don't plan on modifying your engine very far from stock, then this is probably the most economical route to take.
However, if you ever want to be able to modify your engine and tune for it, or even if you just wanted to be able to datalog more easily (with EBL you just plug the USB cable into your laptop). Also, having the EBL allows you to control/disable a lot of what would ordinarily turn on your CEL.