Edit to pull in a clarifying comment:
to clarify, the warning came up immediately after I entered the title...none of the post/question had even been typed into the system
It's amazing that it correctly predicted that the body of your question would be problematic*; I couldn't have guessed it from the title. It may be the phrase "how do you" or perhaps the word "exact" could be what's causing it, but not being familiar with anything about the coding of it, I am unsure.
* More seriously, it's probably a misfiring rule if it just had the title to go on -- on the basis of the question title I could not have predicted it would contain opinion
(Initial answer that discusses issues with the question body)
I haven't encountered it but that sounds like a (perhaps new for CV) network-wide feature.
It sounds like it's a rule in the part of the system that is trying to help people write questions that won't just be closed because they contravene the rules.
Aid along these lines for people writing questions were rolled out on stackoverflow a while ago, if I remember rightly.
It looks like it is picking up on several things in the way you phrased your question that may seem somewhat tendentious.
That is, I think it's (correctly) identifying a problem with your question.
Most directly - you explicitly seek support for a particular opinion: "I would like more evidence that the use of 19th and 20th century approximations play little to no pedagogic advantage in modern intro stats or intro data science courses."
Further, your question as presently phrased certainly appears to express opinions in ways entirely unnecessary to the question (like the use of "addicted" when discussing significance level).
Phrases like "ulterior motive" and "you can probably see where I might be going with this" also strongly hint that there's an opinion being expressed that could be better put in a more neutral way and the system may well be picking up on things like those.
I'd suggest you consider taking notice of it and making your question more neutral in tone (asking for information is fine, asking for people to support a conclusion you already arrived at is usually not).
Your question may well be closed as it stands now.