Not sure if this helps, but to me the tweet analysis seemed a bit shallow. I know there's not much room in a tweet, but it was making each analysis remind me of the South Park episode with the business empire of the Underpants Gnomes (Step 1: Collect Underpants, Step 2, Step 3: Profit!).
I think if you had submitted a link to a blog post rather than a tweet, and the blog post had more depth explaining everything that happened with Lego, I wouldn't have thought of it as weird spam.
I like the idea of analysing business events from over 30+ years ago though, and I wish you good luck with the newsletter! And especially trying to write it in a second language - I've tried learning foreign languages but I'd never be able to write a regular business newsletter in them!