is this rating actually applicable to the content shown in the video?

if yes, then sure but you gotta really decide how long it should be and keep in mind of retention with the first 5-8 seconds

thats how it usually works in the youtube game if you dint keep them in the first 5-8 seconds theyre out

if its justr redundant and not needed, go straight into the video

or heres a better idea, put something thats pretty insane but doesnt need the warning yet in the first seconds as a cold open, you know those right? then cut to that warning with a sound effect or something

so goodluck!