The section does appear to say that corrosion ressistant fasteners are
required. I think the reason is that if your using pressure treated wood
it's because the wood is in contact or near a source of moisture and ,
therefore , the fasteners could rust.
Here is where I believe the Code allows for engineering judgement. I am not
going to change to G.I. nails for the mudsill nailing at shearwalls. A
building official may over-rule my decision, someday.
Tom Jakaby, SE
San Jose, CA