Just a random thought. Up until yesterday this project was open source. The code base won’t be rewritten tomorrow. More likely is that conserved parts of the source code, something like 90% will just remain the same. Particularly the core database schema around users and security are likely to stay the same. Since the old code is already out there what’s stopping me from exploiting the software as it was? This looks an awful lot like marketing to me, and not like real security concerns.