The tweet said Trump's debate performance was the lowest moment in the history of the Presidency, not his COVID response.
And even then, if you think Trump botching the response to this pandemic is worse than George W Bush leading the country into a 20 year war that has caused 500K-600K murders and deaths, then I don't know what moral framework you're operating from. Trump is responsible for botching the response to COVID, but he didn't cause it. It would have spread across the globe regardless of who was in office. The War in Iraq was caused by the Bush Administration and they knowingly lied about it to get people on board. Nixon and Kissinger knowingly sabotaged peace talks to end the Vietnam War and 1.5 million people died during his tenure. So no, COVID does not "beat them all". I don't even know if it's the worst thing Trump has done in office.