You can write object orientated code in C.
The OP never said you couldn't, they said: "no pretense to be object oriented" (Emphasis mine.)
And as far as sophisticated code, I guess the author doesn't consider operating systems or most system programming to be sophisticated.
Again that's not what the OP said, they said C has: "no pretense to be
However, you are 100% correct in challenging the "assembler-like" comment.