I agree with this sentiment. We don't need new, simpler languages to teach programming concepts; we just need a better approach to teaching. We don't skip teaching the English language to toddlers in favor of a simpler one. I learn "cat" before "encyclopedia" and "hungry" before "enlightened". Programming languages have similar levels of abstraction so one can start with basics and allow the growth/understanding/grok to come from exploring the depths of abstraction inherent within.

I think the intention here is to somehow reach a point where the understanding is complete. As if one can say "There, now I understand all of [insert programming language]." and tick off some item on their career progression or bucket list. It's simply not like that.