This is my simple explanation:
Initially they started reporting all AEs in VAERS and there was an o sh*t moment and since then TPTB instructed CDC to limit the reported deaths to fewer per lots (purge the database until it shows what you want).

Ive read somewhere the VAERS DB is managed by a mil contractor with limited medical staff to vet the reports so there is that.

I know it sounds terrifying and maybe tin.