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You submitted this and 4 other articles last week, and they are clearly all your own writing.

There is nothing wrong with that. pg has said that this is quite ok.

Sorry, I didn't realise submitting your own stuff was forbidden...?

It's not. Your post is quality original content, as far as I can tell. I'm kinda curious what the complainer's definition of "blog spam" is.

The guidelines declare your post "on topic", and also condone writing your own post and submitting that:

Are you one of the HN mods? I was wondering how to folks know what was published before etc. without a proper search.