Obviously attention should be drawn to the fact that there is a critical safety update being pushed OTA, but "recall" is too overloaded a term if it means both "we're taking this back and destroying it because it's fundamentally flawed" vs. "a software update is being pushed to your vehicle (which may or may not be fundamentally flawed...)"
I do think something beyond "software update" is necessary, though - these aren't your typical "bug fixes and improvements" type release notes that accompany many app software releases these days. I don't think it would be too difficult to come up with appropriate language. "Critical Safety Update"?