I would say it is true, given you have an Ofna engine. I can't see Ofna having a compelling reason to lie.
Ah, just messing with ya Spit! I think you're good to go, and any engine will run a bit different depending on where you run, the ambient temperature that day, etc. You know all that, so it's not like I'm telling you anything new. Typically, I tune by sound and performance, make sure I'm getting enough smoke and make sure my temps don't get above 270 for any extended amount of time.