Where are you getting this? He is down against Harris in most polls, and neither candidate is clearing a majority. There are projections that he has a narrow edge in winning the Presidency due to the electoral college, but that's not the same as being most likely to win a majority (or even plurality) of the votes (e.g., 538 gives Trump currently a 53% chance to win the electoral college, while Harris has a 65% chance to win the popular vote.)