Here is the Axios story that the tweet references
https://www.axios.com/2024/07/18/president-biden-drop-out-election-democrats
Folks talking 45 state win are not being reasonable.
It required Reagan to have an 18% popular vote win to get 49 states. It’s currently, post gunshot, a 2% Trump lead.
There are 10-15 utterly safe Biden states and that’s with a +2% Trump lead.