Regardless of the validity* of many of the claims it is certainly relevant to the topic.
* And there are few debunked ones.
One source was a video of election workers moving boxes around, with a conspiratorial narrative overlaid. This isn't evidence.
Several tweets showing "voting spikes" in favor of Biden as a result of regular counting operations. Nothing wrong here.
The remaining sources discuss "irregularities of expectation", yet none provide any plausible narrative of wrongdoing. The most plausible explanation is that it Democrat-favored voting methods were more streamlined, reliable, and less contested this year compared to years previous. Obviously this nets more votes for Democrats, but nothing practical is stopping a Republican from voting by mail, either. Also, I wouldn't be shocked if the 2020 election was actually more fair than in previous years, due to a large decrease in wrongfully-rejected ballots. I wouldn't be surprised if more Democratic votes were thrown away wrongfully in 2016 than fraudulent Democratic votes were accepted in 2020. If you're concerned about the legitimacy and fairness of U.S. elections, you can't talk about voter fraud while ignoring historical voter disenfranchisement. If someone thinks that mail-in voting was too easy this year, then their gripe is with the judicial systems that permitted this year's election rules.
Conclusion: The linked website doesn't seem to have very high standards of verification, as most items are obviously flimsy or easily debunkable.
what were the courts' findings?