I hope you mean that:

It is certainly false that if you are able to get CS basics right, you will NECESSARILY be any good at deep engineering.

There are people who get the basics right and are good at deep engineering. The question is whether one predicts the other.

Just out of curiosity, can you give examples of people who have done so-called deep software engineering but stumble at the basic CS concepts?

Right; my "false" applies to the entire statement (if p then q).