Your assumed "conclusion" is only "wrong" with respect to being a valid test for "emptiness".
(There is doubt in physics whether "emptiness" can be ultimately defined)
In the lingusitic literature you will find reference to Benjamin Lee Whorf, a one time fire investigator turned linguist, on account of his investigation of explosions caused by a cigarette thown into a dump of "empty" gasoline cans.
"What works" is always contextual and subject to revision. A "moving sun" works for gardeners but not for astronauts.