How does that unsubstantiate the claim, I don't see any numbers of deaths in that statement?
It clearly says "VAERS reports alone cannot be used to determine if a vaccine caused or contributed to an adverse event or illness". Which is directly contradicting what all those muppets using VAERS data are doing - assuming that VAERS data alone is showing the number of deaths caused by the vaccines. It's not.
The entire thing is one big CYA essentially saying the data may or may not be valid. If anything, that statement confirms his claim that the data contained in VAERS is underreported.
No, it doesn't say that the data "may or may not be valid" (for determining the number of adverse events caused by vaccines). It clearly says that the data is not valid for that purpose - "cannot be used", doesn't get any more definitive than that.