Yes, that's his point of view but he's a bit alone on that. It probably works if you're not using Japanese at all while learning the Kanji, but if you do need to use Japanese (i.e. freshly arrived in Japan) it doesn't really make sense to spend 1 year on kanji before learning the language.
For most people kanji is better learned with vocabulary.
You definitely need to learn hiragana first, and not use romaji at all, but that can be done in 2 weeks.
The idea is somewhat persistent amongst beginners though, whether sources agree or not. I guess that’s a problem of community-lead learning, instead of instructor-lead.
For most people kanji is better learned with vocabulary.
You definitely need to learn hiragana first, and not use romaji at all, but that can be done in 2 weeks.