The most important data point in this poll is 44% of the respondents feeling optimistic about the economy, which is 9 points higher than the previous Fox poll. If Biden can get this number to 50% or higher he'll be a strong favorite for reelection
Yeah, at that point the only thing holding him back would be the age problem, which strong debate performance/DNC speech would dispel.
For a little while, at least. Once Trump truly becomes the obviously lesser choice will Biden be in a more comfortable position. Maybe that will finally happen? We'll see.