What differentiates self inquiry from meditation?

[Travelion]

I just watched Leos self inquiry video and i've got a question.

Isn't self inquiry just meditation?
Isn't meditation trying to put all thoughts away and fully focus on the own awareness?

[TDW1995]

Meditation includes many different techniques and has the primary focus of calming the mind and accepting the present moment as it is. A busy mind is perfectly okay during meditation, but is not ideal for self-inquiry. 

Self-inquiry is more advanced and is solely focused on questioning the subject of experience: you. However, practicing meditation over time can be a great practice to calm the mind in order to do self-inquiry effectively.

A calm mind, in my experience, is a prerequisite to self-inquiry in order to do the practice precisely. 

I'm not at the advanced stages of self-inquiry, but I do wonder if over many years of practice, if it will be difficult to distinguish the difference between meditation and self-inquiry.