Actually, here's why I don't question the results.
because they were exactly what the polls said they would be, and exactly what we should have expected.
Trump only got 46.5% of the vote in 2016. He only got 47.9% of the vote in 2020. That's exactly what you SHOULD expect with a president who has failed in every aspect of governing. Not gaining anything in the vote, just people unwilling to admit they made a mistake doubling down.
Trump's percentage of the vote is actually pretty consistent for the percentage that votes Republican. He did a little worse than Romney, a little better than McCain.
The only reason he "won" in 2016 was too many people voted third party in 2016 to show how "hip" they were, considering all the polls said Hillary had this in the bag. Those people looked at their neighbors going to the hospital or the morgue due to Covid, losing their job in the recession, or losing their businesses in the riots, and said, sensibly, "We can't take another four years of this!".
So, yes, voter participation was up on both sides. And, so what? It was up on both sides. It was still only 67% of the eligible voters.