In all of audio reproduction theater sound reproduction is among the most rigidly controlled areas of audio.In fact its not controlled at all. This is complete misrepresentation. As usual.
The only thing you could possibly be referring to is THX. Which is a trademark, not a standard. THX is for Tomlinson Holman eXperiment, the result of some research they did into what it would take to reproduce sound at realistic levels.
THX was a great marketing move and became the de-facto standard. The key word being de-facto! There is in fact no standard whatsoever, other than the ones THX set, which only apply to theaters that wish to use the THX logo in their marketing. Which a lot did, and do.