It counts. The reason why "le" is colloquial in graduation thesis is because of the lack of substitution for complex verbs and the simple sentence structure.

1. Substitution without complex verbs: In oral communication, "le" is often used to briefly express what happened in the past or the state of completion.

2. The sentence structure is simple and easy to understand: too much use of "le" will make the whole article look too colloquial and it is difficult to convey a serious and elegant feeling.