In a March executive order, President Donald Trump directed the Postal Service
to create the new rules, including requiring states to give USPS a list of all
voters eligible to receive a ballot in the mail and requiring USPS to use those
lists to determine which ballots get sent to voters.
USPS officials were tasked with crafting the details of how the new system
would work, including the creation of a new portal for states to upload their
voters’ information and the back-end software that would allow mail delivery
sites and local post offices to track, and potentially block, ballots
entering into the mail on their way to voters.
The whistleblower is saying the rules are crafted so certain people don't get counted. Specifically, minorities, specifically, democrat minorities.
Yes - USPS should behave like a layer 3 network: moving mail pieces to destination addresses independent of source & destination.
Where elections probably matter to postal services is that they represent a particular shape of mail volume and network usage that may require management to reorganize pickup/delivery resources to meet delivery commitments.
The fact that the USPS would notice elections were being conducted is perverse.