There is a point about industry size (not that many countries dub all their movies), but it is one of the intellectually more challenging professions.
LLMs provide a certain level of mid/low quality content in nearly all mediums. And given that there many people producing such mid/low quality content today, LLMs will have an impact. LLMs affecting sales writers? Sure (not the best sales writers but the point is sales is mediocre but acceptable is a norm).
And say LLMs specifically. There's good evidence the technology has roughly peaked. That doesn't mean it's impact has peaked but it's indication that "all jobs at risk" might be an exaggeration.
We get both "cheaper, worse versions of material that would be dubbed anyway" but also "material that nobody would ever pay a human to dub".
If for no other reason, this tool is a net-positive because it may raise the bar on the quality of dubs expected from dubbing actors.