Please attach a 1-question sample survey demonstrating the issue. Thank you.

I'll create the questionnaire with the demo site.
But you have to see to understand: I put a link to watch the video

http://e-nautia.com/riqcles/disk/LimeSurvey_bugs/Remonte_bugs_Help_No_hide.zip

Download the file
unzip the two files in the same directory
open the html file in a browser (double click)

Here is the survey
In the advanced settings, help is hidden
When testing the question, we see that the aid is not hidden.

PS: I had exceeded the size limit to attach the file to the link for the video?

Thanks for the video.

I am sorry but this is not a bug. The setting is not meant to hide the question help (you can just clear that one), but instead to hide certain otherwise non-editable standard texts like 'Please select one option' or 'Please rank the following items starting [...]' that show up with certain question types.
It seems to be a bad translation.

Maybe you can suggest a better translation on http://translate.limesurvey.org