Hmmm... All designers should know that design Thinking is a series of fundamental principles and concepts. Then, we designers pull out the methods needed for different typews of design. What types are those? Well, off the top of my head some of them are:

1. Product design.

2. Building design (architecture)

3. Social design (systemic design)

The golden rule for all designers is; the concepts and methods are different for each. Dont use methods for one, with another or else you will not be designing, you will be copying like a robot.

As the article says, designers have to understand critical thinking.