I think that's quite simply explained:
People imagine a professional trader to be someone who is always right, but this is by no means the case.
A professional trader is wrong in about 49% of his trades. The 2% of trades that he moreoften trades successfully then also ensure his profit.

If the trader in question also offers his knowledge in (online) courses, he automatically also has a fixed, often very lucrative income. Professional traders such as Brian Beamish, Tone Vays and co. continue to trade, however, and Brian also shares his entries and exits on Twitter/X from time to time.