Some of it is fair. The author does seem a bit egotistical at times. They begin from a premise that "Everyone else is incompetent and I am the savior".
There is a high likelihood that many other people in the org were lightyears ahead of the author. It's even more likely that an engineer or manager in their group was "Banking" the inefficiencies to use during a cost-cutting period - and the author ruined that chance... which will inevitably cause massive suffering and possibly poor performance reviews when there is nothing to trim.
There is a high likelihood that many other people in the org were lightyears ahead of the author. It's even more likely that an engineer or manager in their group was "Banking" the inefficiencies to use during a cost-cutting period - and the author ruined that chance... which will inevitably cause massive suffering and possibly poor performance reviews when there is nothing to trim.