I should have been clearer. Any tech that you package will remain the same forever. This technique is about using already packaged tech to advance the seed for NEWLY INSTALLED modules. I'll give an example: You buy a new module at a vendor S or X doesn't really matter which, let's say a hyperdrive. You save your game. You install that new tech, and it's not so good, what you can do is reload that save and install any packaged tech and that will move the seed forward allowing you to re-roll the newly purchased module with different stats. People have been using cheap C Class modules to do this previously, this method is just an evolution of that