Well, not all of the readers seem to pay attention, but a great portion actually does =)
I, myself, love creator talk in the episode description, it sometimes contains additional info or just an update, of the creator is planning a hiatus, etc. In this regard it is quite useful!
The "creator's comment" - as @A_Toad just said (btw, hi there, we seem to be meeting often in threads, today! XD) - appears right below the last page of the episode and above the reader's comments (in the desktop version). On the mobile app it's only the pages and the creator comment, for the reader's reactions you have to click another button =)
And no, it does not appear as an episode summary, at least not on tapas... the first 1-2 lines of text are displayed when you share it on twitter though =) No clue about facebook tho ^^"