I think you should actually read the reports referred to, the following quotes are important :
Prior to Election Day the Mission visited and engaged with state and electoral officials, political
party representatives and other stakeholders in Georgia, Iowa, Maryland, Michigan and the
District of Columbia. The Mission also observed the early voting process and political campaign
activities in these jurisdictions. On Election Day the Mission was present and observed the final
voting process in the same four states and the District of Columbia.
That's the equivalent of saying there's definitely no evidence of food being present in this house because I checked the attic and there's none there.
It also notes how susceptible some of systems are and seems to suggest not all state software and systems has been approved :
However, vulnerabilities remain. Some states continue to rely on
outdated Direct Recording Electronic (DRE) machines which are susceptible to vulnerabilities and
which do not facilitate a paper-based audit of results.
Voting machines and Election Management Systems (EMS) used by most states are certified by
the Election Assistance Commission (EAC) using the Voluntary Voting System Guidelines Version
1.0 from 2005. These voluntary guidelines are significantly outdated and do not include a
penetration testing process, which checks a computer system for exploitable security
vulnerabilities. The EAC is currently working on VVSG 2.0.
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