Not really into art so i googled it.

Guernica is a large 1937 oil painting on canvas by Spanish artist Pablo Picasso. It is one of his best known works, regarded by many art critics as the most moving and powerful anti-war painting in history - wikipedia

Anyhow, art is subjective. You can interpret it as you like, because its how it makes you feel. And you can argue for or against a point, but it doesn't really matter. As its almost like arguing what flavor of ice-cream is the best.

Art is not entirely, 100% subjective, or else there would be nothing to say about it, nothing to discuss. Authorial intent is not the last word but it can be interesting, and it can impact the interpretation we come away with.

I agree. Art is very loose term, when line between when craft becomes art is very blurry. Same with the meaning behind it.

Someone might argue that author interpretation was intentionally stated in bad faith as a artistic performance etc.

But in the end an interesting discussion is probably the thing of most value (for me at least).

Sure... but authorial intent is also sometimes completely irrelevant. Ask the creator of Pepe the Frog.