There's no trader on earth who has never been wrong. What I believe makes your friend make this statement is the trader's track record of winning trades that's high; when this happens, people ignore the losing trades.
If someone claims a whale has a perfect track record, the first question should always be show me the full history, including the losing trades. Most of the time, that history doesn’t exist or isn’t shared, and if it exists, some people make something look better than it was.
What I see personally about the whale's decision is that s/he is using the Bitcoin 4 years cycle for the trade.
Exactly my thoughts on the subject. There can't be 100% perfection in anything, and when it comes to things like trading, it is obvious that a person cannot make perfect predictions for every single trade they make, and have a 100% profitable trading history. It is just that most people don't like sharing their losses as you said, or maybe people don't focus on that or don't want to discuss them for some reason, but it is not believable to think that a trader can have zero losses in their entire trading journey.
When a person has a lot of funds to begin with, it is possible that they might dodge most of the swings of the market by using those funds, but still, it is not possible that they never made any mistakes and never lost any trades even when they first started. Even whales can get greedy sometimes, because history has proof of whales making large future trades without any stop-loss losing large amounts in single trades, and even if stop-loss gets hit, it is basically consdered a loss.
