You can’t say there is no evidence of fraud in the 2020 election.
The Navarro Report doesn’t prove that Joe Biden stole the election from Donald Trump, but it does provide a usefully constructed catalog of specific allegations. It organizes the allegations into six types (or dimensions) of irregularity and rates their prevalence in each of five battleground states. The result is like a roadmap for discussion of election integrity issues.
I think the report is significant just because it exists. To my (limited) knowledge nothing like it has ever been produced in response to the outcome of a presidential race.