The act of the individual who sent in a ballot that wasn’t theirs or attempted to vote twice in some manner is fraud. They are also identified through the normal checks and balances of the election process and those second votes are disqualified.
Clerical errors such as sending out double ballots is not fraud.
On the topic of dead people, not one of the thousands of accusations has been verified to have a vote counted. On the other hand countless names have already been debunked.
I can see the bias in that site in the URL. “Legal vote” has become the dog whistle du jour. Then I clicked on the links and it immediately went into debunked claims of count stoppage, mail in fraud, lack of onsite witnesses, ect. The first outbound link was to Gateway Pundit which is known for spreading misinformation and conspiracy theories.
It claima the evidence ia “beyond iron clad” yet the Trump legal fight hasn’t won a single case on any of these claims.
Keep looking though guys. The bombshell is probably around the same corner as as the pandemic. Hold on tight. We are rounding the turn.