Sorry if you find the ideas repugnant - but I don't think the discomfort is at odds with the underlying truth.
I expect the idea that one might not actually be an Artist is not going to be popular if one has devoted a lot of time and effort to the romantic notion and cause of Being an Artist and one's 'art'.
In essence, Art was and is the keystone of what we now call the 'luxury' market, and has always served a similar purpose in society. The romantic notion, which is important to that role, that Art is for arts sake, and pure, tormented, etc - the oppositions and transgressive challenge are very important to the intellectual underpin of its role for the rich and powerful.
I agree that not everyone who wants to be an artist is actually an artist. However it is not very interesting to talk about what is or is not art: potentially many different things can be called art. It is the value placed on art: that is what we are really discussing here.
This point about art being a luxury commodity is only true if you view the whole of art history through the lens of late Capitalism and our current neo-liberal political mindset.
Art has served many different purposes throughout history. Arguably it still does, despite the prevailing orthodoxy that only art validated by the market has any worth. Artists and craftsmen have only been validated in this way since around the 17th century. Even now the market is not the sole determinant of value. Other institutions in society, particularly the various organs of the state, confer status and value on art too. So do academics, critics and art historians, who may or may not agree with what the market values.
I would prefer to discuss visual art as part of a wider field of cultural production which includes craft, the performing arts, design, music, publishing, media and entertainment. Different values are placed upon the various products of culture according to their function in society, perceived status, etc.
I can recommend reading Pierre Bourdieu and Walter Benjamin as starting points to demystify what is really going on in the arts and culture (in the West at least). More accessible is John Berger's "Ways Of Seeing", a BBC series from the 1970s and an accompanying book which distils some of Benjamin's ideas (and those of others, eg. Marshall McLuhan) in a "popular" format.
https://www.youtube.com/watch?v=0pDE4VX_9Kk