Isn't it more likely to be changing words to disguise plagiarism?

Update: looking at some of these, I think it is probably just poor machine translation.

Yeah some kind of translation issue. The papers seem to know what they're talking about, and I don't entirely get the AI gut feeling, only on the key words.

Good point, but I see lots of articles are using this "kidney disappointment" so maybe but.. holy toledo look at Impacts of Renal Transplantation and its Mental (2023) by Renan Kamath : “organ disillusionment,” “kidney relocate dismissal,” and “excusal of the moved organ.”