alt Hacker NewsI think a couple of the comments in this very thread above, e.g. https://news.ycombinator.com/item?id=49467695 and https://news.ycombinator.com/user?id=slibhb are quite relevant to your case. Thinking this is just semantics is a strong indicator you are likely highly aphantasic.
It is highly unlikely to just be semantics, because when it comes to visualizing complex objects as a non-aphantasic, the specific details spring forth unbidden as an image first, and then you attach the language, and it isn't the reverse order. I suspect also tests of visual memory of complex pictures should reveal similar things here, because e.g. language and other things don't really seem to be able to represent such details, and neurobiologically, there isn't much plausible other way your brain could be memorizing a complex photo without retaining / having activation patterns similar to the actual viewing (and this is what we see in fMRI studies).
If you are careful at noticing your thoughts (and not aphantasic), you can also notice if you are a highly visual thinker, you might sometimes confuse certain memories of things (spellings, place names, other things) that are similar only visually, but not logically or in any other sense modality representation. This would suggest the representations are genuinely visual in these cases.
But yes, no way to be 100% certain, but the "it is just semantics" case is very weak and can't explain much.
I am reasonably confident I am not aphantasiac in the sense described here. My apple is red with some nice green mottling, dust, etc etc. I can see my wife and children in detail in my "mind's eye". As a child people told me I had a "photographic memory", which I also think is sort of "fake" or semantic, but nonetheless: I can remember images I have seen with visual detail and I can imagine hypothetical objects "visually". I still think many self-diagnosed aphantasiacs are tripping on the semantics of wording in a self-report survey, because I could easily talk myself into the other label based on second-and-third-guessing "but what does it mean to _see_ something I'm imagining?" etc. If there is a group of people with an actual quantifiable brain difference, I suspect it is much smaller than the group of "all self-diagnosed aphantasiacs".