Yep, you're right these are the public investment notes the VCs share which will definitely have a positive PR spin to them. But it can still give some helpful insight into the thesis behind their investment.
Absolutely there's value here and it's a great site - kudos! Just would be helpful if you changed the wording as "investment memos" are actual documents in the investment world that these are not (would be similar to calling a product announcement a "product manual").