The article links out to OpenAI's advice on prompting, but it also claims:
OpenAI does publish advice on prompting o1,
but we find it incomplete, and in a sense you can
view this article as a “Missing Manual” to lived
experience using o1 and o1 pro in practice.
To that end, the article does seem to contradict some of the advice OpenAI gives. E.g., the article recommends stuffing the model with as much context as possible... while OpenAI's docs note to include only the most relevant information to prevent the model from overcomplicating its response.
I haven't used o1 enough to have my own opinion.