Few people doing so well would share such a process, but in theory, if they did, and it worked, it would likely trigger a flood of followers, and the behavior of the markets would shift alongside it.
Presumably someone making this claim is a billionaire. Or they've being doing well in stocks for a short enough time that it's yet to be proven if they are as good at timing the markets as they think they are.
Those people (we people) know not to try.
And if it did come from predictive ability, then everyone would just copy their predictions and arbitrage it out.
If they are broadcasting it, the broadcast is part of the strategy.
The guy who could died last year.[1]
[1] https://dailyprofitcycle.com/market-commentary/the-legacy-of...