Yes, "The Kratky Method" is another phrase used to describe the same thing (a water culture system without a air
pump). I even wrote a section explaining The Kratky Method as well as water culture systems in detail on this page:
Water Culture System
No mater what you call it, a water culture system is a water culture system. There are only
6 types of hydroponic systems. Every
hydroponic system there is, is either one of these 6 types, or a combination of 2 or more of the 6 types. If you understand what makes these 6 types of hydroponic systems different and how they work, you can identify any hydroponic system in seconds.