I don't know why the answer has to land exactly on top the strict dichotomy of "Sony does not care" or "Sony couldn't wait to announce it". I doubt Sony is putting much through or resources into playing mind games but they are not above an indirect jab by way of announcing more specific numbers now, it doesn't cost them anything.
Also, has there ever been a case where a company lied about sales numbers in an official capacity? And I am not talking about lumping consoles together or other ways to obfuscate numbers but directly lying about units moved? Why would they do it now, when it has no financial impact?