Sadly that is true. A Ph.D thesis should have a minimum of 200-300 pages.
This is why I hate academia. It's based on rubbish like how many references your paper gets, or how big your vocabulary is. Not so much the actual idea you're writing about. Sometimes I read an entire page which could be summarised in one sentence without losing any content at all.
Source: I work with academics/researchers and see this every single day.