I don’t think a persons paper overrules a dictionary. I can’t comment on the chapter you linked as its behind a paywall.

That aside, we all understand what the OP is asking, hence my opinion that a lengthy paragraph explaining how a very niche group of people differentiate between two words that the majority of people (including OP) and the dictionary define as synonyms is masturbatory.

I mean no offense. My comment is not intended to upset you. It is intended as critique. I apologize if it came across in an attacking manner.

This was a very masturbatory response. Its wildly over-complicated. Forecast and predict are synonyms, they both infer estimation. You can check a dictionary if you don’t believe me. There is a much more simple straight forward answer to the question here, check my direct reply to the post.