The source examines shaking ground coffee before espresso preparation as a way of reconsidering distribution. The technique is interesting because it adds a step before the coffee bed is ready for extraction. An attractive explanation or a single successful shot does not establish an advantage in every setup.
If trying the method, keep the dose, basket, beverage yield and coffee consistent. Record how grounds are transferred and distributed, because a change in handling can affect more than one part of the routine. Compare several preparations rather than judging only the most photogenic result.
Taste is one part of the decision. Additional containers, cleanup, spills and preparation time also belong in an assessment of daily use. Keep any measured result tied to the actual equipment and method used, and do not repeat another person's performance claim as your own testing. A technique is useful when its contribution is clear enough to justify the extra work.
The conversation
A good question can make a better brew.