Because there has been a marked change in Biden from 4 years ago.
"Debate watchers were pretty decisive in their verdict of last night’s performances: Only about one-third said Trump’s performance was “somewhat good” or “very good,” and 50 percent said it was “very poor.” Biden’s performance was more positively received, with around 60 percent saying they thought he performed well."
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Who Won The Debate?
How voters felt about 2020 presidential candidates Joe Biden and Donald Trump before and after the debate on September 29, 2020projects.fivethirtyeight.com
"According to a CBS News poll taken following the 2020 debate, 48% of people thought Biden won, 41% of people thought Trump won, while 10% considered it a tie, with a margin of error of three points."
Dont think for a second that excuse holds any water. The only marked change in that he went from awful to even worse.