Easy Tiger!
Couple things here. If you have ever had to tear down a fully set up 220G then you know how much work and a PITA it is, so I am pretty sure you can not call someone lazy for taking that on.
As for the cause of the the problem, he seems to have indicated where he is confident the problem came from. If your comment of him being lazy was from the perspective of why didn't he do something about it then as it got worse, well he has offered an explanation for that oversight as well. He clearly said he was rolling in poop happy that he felt he was getting great coloration of colaline. Clearly that turned out to be wrong.
Everyone is trying to learn her (or at least they should be), and everyone has different levels of experience. That coupled with the comment of the decades you have been doing this suggest so me that you know better how to talk to people. With all that experience I'm sure you have a ton of helpful hints to offer. I can only imagine his frustration.