This is exactly it. No one has provided any data to prove Defund lost the Dems a single seat. “Everybody I talked to said..." does not cut it as empirical evidence.
Two reads on this:
“Defund the Police Cost House Democrats Big Time. Or Did It?” https://link.medium.com/ZGduxtieobb
“Joe Biden Won the Election Now Can the Progressive Left Please Shut Up” https://link.medium.com/XH3nfC13Fbb