Do you think reading books still is valuable specially at beginners levels (students in university learning topics for the first time) or using LLM to understand ambiguous parts faster is an alternative.

Absolutely, the experience of reading a book still beats reading a summary or an LLM version of a book, you challenge your own brain to understand new concepts, which in turns grows your brain and cognitive abilities, instead of getting used to pre-digested information, with hidden biases.