He never mentioned how much BTC he had in the first place. Woz's net worth is estimated to be around US$100 million currently, and I doubt he earned even $100 thousand by selling all of his BTC at the peak price (if he did that at all). Apparently, there's nothing to boast about for him lately, and it's a pitiful sight, frankly speaking.
It is also quite possible that he might have sold at much lesser price but now telling he sold at all time high of 20k. Good for him if he was able to manage to sell at right time before the market started to crash and would have invested all the money in his new venture.