That's correct. However, does the size of the whitepaper really matter?
I think the major point of any project should be in delivering and fufiling whatever it is that was promised in their whitepaper and not whether the WP is long or small.
You will have to do a whitepaper comparison with other Defi projects, then you will know the answers to your own questions.
All projects must realize the roadmap according to the whitepaper, but look, after analyzing the whitepaper on this project, is it worth investing in?