From what I know, my cohort had to worst attrition of any in history but no students were kicked out. A total of two dropped. One of those two left in the first or second week and the other had some medical issues, left and then returned to join a later cohort.

As far as I know, students who have left have all left in the first half of class and generally because they don't enjoy spending all their waking hours coding and realize they don't want to pursue that career.

Even counting those students against HR (which is ridiculous since post graduation employment stats never count dropouts), the hiring rate would be over 90%. The salary figure (110k avg.) is also depressed by the fact that the school itself hires the strongest students from many cohorts.

Most schools seem to keep up their placement numbers not by dropping students but by counting any job they get as a job in their field. Oh you got a job at mcdonalds? Well they have computers so that counts.

In the OP video, Hack Reactor claims an attrition rate of 10% and a placement rate (as software engineers) of 100%.