Actually, Capital World Investors does Not own PNNX shares. They owned shares back in 2016 but not any longer as per the lists below.
The company was not reinstated. I'm sure it has shown active right along. Just like the many other PA companies I searched that have not had filings for years and still show active.
The volume came in because there was a false rumor of reinstatement. See the document below from the SOS that was ordered yesterday. No reinstatement filing.