VAERS's own data-access page states the system's core limitation: reports alone cannot determine that a vaccine caused an adverse event, and counts of reports cannot be read as causal evidence.
VAERS reports may contain information that is incomplete, inaccurate, coincidental, or unverifiable… The number of reports alone cannot be interpreted as evidence of a causal association between a vaccine and an adverse event.
VAERS's own data-access page states the system's core limitation: reports alone cannot determine that a vaccine caused an adverse event, and counts of reports cannot be read as causal evidence. Supports the book's caution about raw VAERS data while contradicting causal readings of VAERS counts.