Just because you can memorize anything you want to, that doesn’t mean you should! Some people go too far after realizing that they now have the ability to memorize anything they want.
You may well be able to memorize every specification of an aircraft or boat. It’s often better though to find a balance between what you need to memorize and what you can reference in a non-time-pressured environment. For example, it’s unlikely that you need to recall the battery serial number! Memletics aims to improve the speed and quality of your learning, not necessarily the quantity.
Also, there are many techniques in this book. This does not mean you need to try or use every one of them from the beginning. Pick the ones that suit your training material, and come back to others as you need to.