The best advice I can offer you is to stop reading the internet unless it is a side run by physicians (american heart association, heart rhythm society, webMD, etc.). The first step to answer a question is first to understand the question. If you look up VT without knowing the type of VT, it is going scare you to death.
It sounds like you have normal heart VT. This means that risk of you dying from cardiac causes is unchanged from a normal population.
70% of the population has PVCs every day. I am not sure what percent has NSVT. The important point is not the frequency, it is that normal heart VT is not dangerous.
If you have triplets of of NSVT, it is very possible that you did have an 8 beat run of NSVT. To answer your question tough, yes I have seen many (MANY) holter reports interpretted by a computer that call things NSVT that are not NSVT. This is why it is important to do more than ready the computer generated summary.
I would not focus on whether the report many years ago was correct. Assume that it was correct but also understand that it doesn't change your prognosis. From the sounds of it, your prognosis is very good. I can't truly judge that though without reviewing all your medical records -- you will have to trust your doctors on that one.
I hope this helps.
Is there any way you can get a copy of the old Holter so your current doctor could take a look at it? The actual recording, I mean, not just the summary? Your doctor may be able to request it.
I know when my old cardiologist would go over my Holter results with me, she was kind enough to look with me at particular times I had noted as being of concern to me, so we had some discussion about various things. She mentioned that it takes some care to read the recording correctly. The machines that label them are often wrong, for example. So I can imagine someone in the past making a mistake.
It looks like they have tested your heart very thoroughly, so personally, as a layperson, I I think you can set your mind at ease about this.
If it's any comfort, last year a doctor told me I had either leukemia or multiple myeloma, and had six months to live, and he was completely wrong. I still have not calmed down about that. I know I don't have those things, having been assured by an oncologist, plus having no symptoms a year later, but I am now a nervous wreck about seeing any doctor as I always expect them to tell me something horrible. Sometimes I think we'd be better off living in the woods instead of seeing doctors.