Nah, it was that we in the US had lethal injection vans for a while for a lot of the same reasons as China. We transitioned to lethal injection because it was seen as more humane than hanging or firing squad, but our more rural jurisdictions didn't have the resources to retrofit their prisons on the time table that politics required, so instead would share "mobile lethal injection facilities" starting in the 80s.

And yeah, in my mind Wikipedia has fallen from what it promised to be originally. It's so easy to slant the tone of an article by careful deletion; it's an assymetric battle against free exchange of information.