For example, if you know Italian and you want to learn Spanish you can translate a lot of your prior learning. The sounds are the same, the sentence structure, and many of the words even. Even English to Spanish isn't that different.
When you know English and you want to learn Chinese you have to learn a completely different way of pronouncing and listening to language.
I think her point is that non-technical people don't realize that there are a lot of fundamentals and basic principles that you need to learn to code well that you can't just pick up in your non-technical life.