Arguably for a lot of stuff that folk encounter that some count as "subliminal" just means they don't understand the language and employ of framing devices, juxtaposition, abstraction or rhetoric. We need to start teaching that shit as basic literacy in schools because once you understand them it's not "subliminal" anymore as it becomes readable text.

The simple presence of an ad in your peripheral vision definitely counts as properly subliminal though and it's still a menace.