What was predicted
Chamath said in early October 2020 that the odds of Joe Biden winning the November 2020 U.S. presidential election were about 65–35, approaching 70–30 in Biden’s favor ("Biden 6535, approaching 7030."). This is a probabilistic forecast assigning a substantially higher chance of victory to Biden than to Trump.

What actually happened
In the 2020 U.S. presidential election held on November 3, 2020, Joe Biden defeated Donald Trump, winning both the national popular vote and the decisive majority of Electoral College votes. Major news outlets and the official certification process confirmed Biden as the winner.

Assessment
Because the event to which Chamath assigned the higher probability (a Biden victory) did occur, this probabilistic prediction is directionally correct. He did not guarantee a Biden win, but he judged Biden as the clear favorite and that outcome materialized.

Therefore, the prediction is classified as right.