The sentence you've mentioned is only related to samples included in the package.
API comes in the form of native Windows DLL with C functions, which can be used directly by C/C++ programs. Other languages/platforms usually have some means to work with native DLLs. For instance, the package includes
iPiMocapAutomation.Net.dll assembly for using automation API on the .NET platform (C#, VB.NET etc).
For Java or Delphi you should create yor own binding for native
iPiMocapAutomation.dll. See the following links for help:
http://blog.mwrobel.eu/how-to-call-dll-methods-from-java/https://stackoverflow.com/questions/14940771/calling-c-dll-from-delphi-program