Yes, if you are to believe another clueless home inspector, it is correct. If I understand his claim, he is testing a circuit that has no legitimate grounding, which is quite common in older homes. He then claims that there is also an open neutral. On the same circuit, you can't have both. Now as defined as an electrical term, "open" simply means that a conductor has lost a connection, and is no longer providing a current carrying path. This can be from a multitude of causes in a residential setting, loose connections at switches, breakers, or other terminations, wire nuts that fell apart, or a cable that was accidentally cut. So, in a simple circuit feeding an outlet you have the hot wire supplying current, it then returns to the panel on the neutral wire. If there is no ground, and the neutral is open, there is no current path, and no circuit, therefore the tester cannot read "open neutral" since it is powered by, and analyzes, a live circuit.
Seriously, putting a lot of faith in the work product of a typical "professional home inspector" can lead to some pretty unhappy results. I nearly killed a deal recently when I got a thirty page report while reselling a custom home that I built for my family. It had at last 25 claimed defects. The issue? Well they are countless. The guy had a state license to do radon testing, but failed every best practice state and federal protocol when stumbling through the process at the home. He contaminated water samples before he sent them to the lab. He listed "violations" that were nothing but his delusional and incompetent OPINION on work that was completed according to strictly enforced current IRC and NEC standards, and he made wild, libelous claims on topics he literally didn't have a fucking clue about.
Now that was the worst case I have seen in thirty years of dealing with home inspectors, but it was hardly unusual. They tend to be particularly clueless when it comes to mechanical systems, with electrical being the worst offender. It's either sad or funny, depending on how you view it, but while doing research I occasionally hit on one of the "professional home inspectors" forums, and just shake my head at some of the insane shit posted. It's nothing for a "professional member" of one of these forums to post a comment or question with their personal icon listing all their professional certifications, and how many years in the business, then proceed to ask a question, or make a declarative statement that makes it quite clear that they haven't got half of a clue. The best are the ones that totally misunderstand how a correct detail, or technique looks, then brag like some mall cop that they, "have been flagging this violation for years". Nice job, dumbass. Create issues, with buyers, sellers and agents based on non-existent issues that you believe are a problem. It gets to the point that service plumbers, HVAC and electricians, can identify inspectors based on the stupid crap they are telling their clients. For example, I got flagged for a non-existent safety issue with a water heater P&T valve. I asked a local service plumber about it, and he replied, "is this about that asshole home inspector from the next town over?"
It's enough to make your head hurt.