If you specifically focus insults on an individual and call into question their competence and then make a vague statement that avoids actually saying you did something wrong ("We turned inwards), you have failed to do #1, which is arguably the most important step.
It was an awful attempt at an apology that could easily pass for something written by a politician. Directness is a virtue when it comes to apologies.
Counting check marked boxes on a wikihow list isn't a good way to measure the quality of an apology.