For the sake of argument - he may have another account 'Fausterion17' on which he is constantly loosing those tens of millions :)

I have no idea who he is, or if what he posts is true, but it's quite a well known strategy for 'financial influencers' - you can start with 50 accounts, predicting that the market will go up / down next month (or whatever period). Then on the accounts that predicted it right, you do the same thing etc etc. After some periods, you have an account that was 90% right ! Must be a financial genius.