Why it matters
An LLM tells a buyer "per Acme Hydraulics, the max working pressure for this hose is 5,000 psi." Acme never published that figure. If the real rating is 3,000 psi and a maintenance tech acts on the answer, a line fails and Acme's name is on the spec that caused it. That is not a ranking problem. It is a safety and liability problem wearing your brand.
Industrial buyers treat a cited source as the authority. When an engine misattributes a number to your catalog, the buyer trusts it because your name is attached. You did not write it, you cannot see it, and you may never learn it happened until a customer quotes it back to you.
Hallucinated attribution vs brand hallucination
Brand hallucination is the engine inventing a fact about you, like a product line you do not sell. Hallucinated attribution is narrower. The claim may even be true in general, but the engine pins it to a specific source that never said it. The damage is the false sourcing, not the false fact.
In practice
Run your own part numbers and spec questions through the major engines on a schedule. Watch for answers that quote a torque value, pressure rating, or cross-reference "according to" your brand. When you find one, the fix is to publish the real spec in clean, machine-readable form so the engine has a correct figure to ground on, then re-test until the attributed number matches your PIM data.