In case anybody is curious about the claim that October 23 is too late, I updated the Wikipedia page listing the past debates to include the date.
https://en.wikipedia.org/wiki/United_States_presidential_debates
In general, the first debate takes place in late September or early October, and the final debate occurs in mid to late October with two or three debates being the norm. The first debate occurring in June is new this year as the debates normally start after the nominations are complete.
So, unsurprisingly, Trump's argument has no historical basis and complaining that the debate is too close to the election is nonsense.
Your assertion is that Biden has not tried to contact DeSantis to offer help. You were provided with an article that says otherwise and dismissed it as false. What evidence do you have that supports your claim that Biden has not attempted to contact DeSantis? Other Republican governors have said that Biden was quick to reach out in regards to Helene, so it's hard to believe that he hasn't tried to contact Florida.