I suppose the HN software changed it and the submitter didn't notice (or didn't care). It happens silently after submitting, unlike the "13 too long" message that blocks submission.

Many of those rewrites are benign, even good, many others are stupid and infuriating.

Unfortunately there is no way to have yourself declared to be a "well-known submitter with a history of not editorializing or outrage-optimizing submission titles" and get this thing switched off.

In this case there have been so many discussions and submissions about the American with Disabilities Act that it sounds plausible to be such an automatic rewrite.