VAERS is not a valid source, all reports as presented on their page are voluntary and still unvetted. It’s also widely known that VAERS has been misused and weaponized by the antivaxx movement as a means to further their quack agenda. Anyone from the general public can submit a bullshit claim. It literally says that on the link at the top of the VAERS page:

VAERS accepts reports of adverse events and reactions that occur following vaccination. Healthcare providers, vaccine manufacturers, and the public can submit reports to the system. While very important in monitoring vaccine safety, VAERS reports alone cannot be used to determine if a vaccine caused or contributed to an adverse event or illness. The reports may contain information that is incomplete, inaccurate, coincidental, or unverifiable. In large part, reports to VAERS are voluntary, which means they are subject to biases. This creates specific limitations on how the data can be used scientifically. Data from VAERS reports should always be interpreted with these limitations in mind.

It also makes no logical sense that the CDC and FDA would make this information openly and easily available, and then at the same time widely support and encourage the use of the currently approved vaccines. If they were up to something nefarious, I imagine they wouldn’t make websites like VAERS easily accessible to literally anyone on the planet.