The writer is very confused. A dissertation is the written document you write to defend your thesis (., claim).
In France, the academic dissertation or thesis is called a thèse and it is reserved for the final work of doctoral candidates. The minimum page length is generally (and not formally) 100 pages (or about 400,000 characters), but is usually several times longer (except for technical theses and for "exact sciences" such as physics and maths).
What valuable company is nobody building? This question is harder than it looks, because your company could create a lot of value without becoming very valuable itself. Creating value isn't enough—you also need to capture some of the value you create.