Day trading is not suitable for beginner, it is for experienced trader. If you have been trading for a long time then you can do day trading.
He did not mention anything about beginner of course it won't suita them since they don't know anything about trading. It is perfectly suits for professionals since they know the fundamentals and they are experts they don't fear of risking anything they have, it is actually goof for those who are trying to learn the basic trading. Scalping or trading is for new learners.