It's an explanation of why a Java client would be suspect as an "investor" - experienced dev teams don't release them. Most of these projects are primarily marketing ventures ("look, we're the next Ethereum!"), a lot of code is outsourced, and the average "investor" expects a handwavy explanation of how it's The Future with lots of big words that that they trust is correct. Making odd/different choices (DIY crypto, Java reference implementation) hurts that idea.