This is something you'd learn in your first year at law school. If, as Trump's complaint alleges, Dominion did destroy evidence then the evidence is immediately assumed to support the opposing party's allegations.
Biden's defense would now have to prove there was no fraud as if Trump's team had certain evidence of there being such.
Nothing has been proven because there has been no case yet.
We believe we can prove it and we are currently trying to either prevent it from occurring or prevent it from getting worse.
I don't address it because we aren't there yet.