Yes, but the term "organ support" is recommended. The fetus needs the placenta. The placenta needs blood flow, oxygen, and nutrition, which requires all organs to remain functional. But artificially-sustained function for this long is not the same as natural and is likely unhealthy for the fetus.

Has it ever been successful in anything but extremely short term cases?

Yes, there are successful cases, but this is the earliest attempt I'm aware of. Will be reviewing the literature. Here's a fairly recent case: pmc.ncbi.nlm.nih.gov/articles/PMC...

besides being 16 weeks and not 9m which would be very important, this is the important part: "A discussion with family members began after admission to the ICU. The agency in the decision-making process was given to the father of the child, but other family members’ opinions were also considered."

"With respect for the family members’ wishes, a decision to proceed with the somatic support was made by the ICU team leader, in consensus with all ICU team members."

Yes, this is the most important ethical difference and what the current family was not allowed: an opportunity to consent after all risks and benefits were sufficiently explained.