Weber is a long-term premium brand. Hence plenty of skin in the game. I've had similar experience with manuals (or web sites) for cooking/kitchen products from similar brands.
This reminds me of When my great grandmother became unable to cook and decided to pass her recipes along, it turned out that half of her “traditional southern food” classics had been from some old southern living cookbooks or the back of a Betty Crocker box somewhere.
She made a cookbook of her recipes we all enjoyed for years and years and she included some of the original cutouts and index cards from probably the 50-60s or so. There’s also a lot of steps that you’d expect from a grandmother “cook until done” and “add some spices” to some of them.