He is at least postings things that are mostly experienced by losers.
Nothing is possible, especially nothing that HE cannot achieve. Thats seems to be his POV.
If he would be a very successful trader he would be fulltime trader and not run his business anymore.
I agree that things can/are very difficult, but they are not impossible. The result of an "average trader" (which is the average of traders who do worse but also from traders who do better, proves already that some traders do better) can not be projected to one specific person and taken for 100% as the only truth for that person.
All successful people are above average in what they excel in. There are thousands of samples around the world. Maybe Sig himself is above average in his business, so following his logic he is in that case doing something that according to him he should never have done, as the "average" businessman would not succeed in what he achieved. Success equals/needs being above average.
If nobody would do better then the average person, each person would have the same score, as that average is the sum of returns from all traders divided by the number of traders. If nobody ever goes above the average, nobody can go below the average too at the same time as otherwise the calculation would give a lower average. And at that point there would again be traders above average.
I don't like people who discourage others not to do this or that. Better would be to tell them it is difficult, or even very difficult, but to tell it is unrealistic is trying to keep them poor as you envy them if ever they would be more successful then yourself.
I hope my children will be more successful in trading then myself. It would make me a happier father.