Accepted for a PhD, only want to earn a Master's

Sure. That’s why I said “sometimes.”

Sure. That’s why I said “often.”

Yes, if one attends an academic master’s program - which are generally intended to emphasize research or scholarship and are often intended as preparation for a later PhD program - there may be no career advising or help finding an internship.

If that were the case, though, I would argue that even that master’s program likely wouldn’t be a good choice for someone who wanted only a master’s and then to work after (unless they specifically wanted a narrow band of research careers you can do with an MA/MS). Who wants to pay hundreds of thousands of dollars to a university program that won’t support them in finding internships and careers?

Yes, many MA students can conduct research, and some are even funded for it (especially in the sciences. What I said was

If research is not your passion and you are not interested in a research career, prepare to be disappointed and perhaps miserable. Doctoral students are expected to do research.

Master’s students can certainly find research experience if they want it. PhD students cannot opt out of conducting research.