Neither the human orphan nor the widow is fixed by your description; they simply aren't alone either more.
The child is still an orphan; the woman a widow.
This is an acceptable use of the term "widow". From the Oxford English Dictionary [0]:
> A short line of text (usually one consisting of one word or part of a word) which falls undesirably at the end of a paragraph, esp. one set at the top of a page or column.
But there are dozens of contradictory meanings for "widow" and "orphan" [1], so the definition that you gave isn't wrong either.
[0]: https://doi.org/10.1093/OED/1579263894
[1]: https://tug.org/TUGboat/tb43-1/tb133chernoff-widows.pdf#subs... (Disclaimer: I'm the author of this article)
We're going to see more of this once diffusion language models mature. They won't match the exact length but will sure choose words to fix the set number of tokens.
I've sometimes heard "orphan" used to represent a single word left alone on its own line at the end of a paragraph, but the terms are often confused and Carter could have used "widow" in that sense.
I'm curious to see what the hard-copy scripts actually looked like. The soft copies I've seen aren't particularly idiosyncratic but maybe they've been normied: https://www.dailyscript.com/scripts/the-x-files_production.h...