Good point, however, and there is always "however" - a clarification is called for.
There is no subsititute for proper wiring technique, which is unrelated to a light bulb, being on or off, dead, flickering, or even having one at all.
Since the member is responsible for his actions in terms of safety, then he is not to count on a light bulb to find out what the proper wiring technique is including how to connect portable power. There is plenty of wasted tax money going to the court system to cover people blaming other people for their faliure to be responsible for their own actions.
We are making assumptions that the member is a competent DIYer and that he knows how to properly do what he did. Otherwise he should not have taken on the task himself and instead hand it off to a professional.
You will see that I did indicate to contact the manufacturer of the panel to find out the meaning of "flickering", which no one here knew what exactly it means.
If I did the job as a DIY, I would have wired the boat properly from the get go, connected the generator properly from the get go, with no risk or safety to any person. Otherwise, I had no business doing it. So, the flickering light doesn't change the work I did nor anyone's safety.
If the panel manufacturer didn't care to respond, then I would have done exactly what I advised, ignore it.
Each member is responsible for what advise they follow. As in my case on this site I represent myself as a DIYer, I am not a professional on this site. The member has no recourse to take legal action against me, on the otherhand, in your case, he can. Keep your liability insurance payments up to date.
Irrespective of what the legal aspects are of offering advise, my advise is always directed at competent DIYers and is never something I wouldn't do myself and based on decades of experience. No one is obliged to follow my advise and is free to ignore it. For myself, there is no profit nor loss associated with whatever I write here.