It is, and I think that's where GP went a bit too general in his conclusions, which I otherwise share.
The problem with CIoE is "the other observer" - the other people, that judge you for not sacrificing 100% of your resources to deal with an issue that's far outside your area of responsibility, but that you noticed and dared to help with (or even comment on it). That's no way for a society to work. Completely untangling what's wrong with this view is nontrivial, and touches upon a similar question of why won't you, or me, sell all what we have, give it to the poor, and forever live in poverty (as Jesus would want us to).
In this case, I think GP meant a more complex relationship than the word "aware" in "if you are aware of potential ethical or moral liability" would make you think. I think they meant "aware" as "aware in detail and having power to meaningfully affect the outcome".
I'm aware of a lot of bad things that happen on the other side of the planet, that are not in any way caused by me, and which I have no good way of helping with. So I don't think bad about deprioritizing them in favor of things I can help with, as there are countless other people like me over there, who are both aware and able to help with the problem.
Also what matters is the scale and scope of the problem. A manager at a plant can, by their own action or inaction, cause people to get hurt, or prevent that from happening. In this case, not only ignoring the problem they know about is morally wrong, but also doing steps to avoid ever learning about a hazard is itself doing wrong. But that same manager won't single-handedly solve the housing crisis in their city, so I wouldn't blame them if they decided to stop reading news to preserve their sanity.
WRT. consulting businesses, I'd say the knowledge about how they're screwing up companies (and countries) is known, but not widely enough to blame a random new college hire (you have to contrast that with the marketing these companies do to attract employees - so I'd redirect some of the moral responsibility towards people who know and work to get others involved). Joining despite knowing about these things? That's another thing entirely.