"Election Skeptics" refer to people whose candidate didn't win, or as you said, who deny Joe Biden's win in 2020.
What do you mean by this? It's not as if every 2020 Trump voter believes that Trump won 2020. (Although, I did find out that about 60% of Republicans believe that Trump won 2020. https://www.politifact.com/factchecks/2022/feb/02/viral-imag... )
Incredibly naive.