It can be true and it can be not. The article says "don't study English Grammar too early", it didn't say don't study grammar at all. So, you study English without grammar, when you come to a certain level, you start studying grammar.
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AnonymousHow can I speak English fluently without studying grammar ?Imitate native speakers. The vast majority of them don't know anything about grammar, and they speak fluently without any problems. Of course, you'll have to stop asking "Why?" all the time and just use the language the same way that they do without thinking about it.