I never believed anyone who says they have a 100% win rate. If your friend, who is always updated, made a statement like this, it doesn't validate what he says. He might have read fake or overhyped news, or might have read the title only because titles are meant to be like this when you don't care about the news haha, but only care about views.
Well, maybe your friend did not read the whole report about that whale. Did you ask which whale it was, and did you ask more about the whale's history? I would have, and I would even have asked that friend to show me.
I searched online and found nothing, but there had been a discussion about one whale who appeared to have a 100% win rate, but not for long. In just 21 days, his winning rate broke, he lost all his profit, and was left with only $1 million after losing around $28 million.
https://panews.io/articles/dbd481d0-af34-446e-85ab-e5e7f38e570a