The quote is from Pascal: "Je n'ai fait celle-ci plus longue que parce que je n'ai pas eu le loisir de la faire plus courte", "I made this one [the letter] longer, since I didn't have the leisure to make it shorter".
In the spirit of generosity, I'll assume that was a very sly joke, and not an ironic misunderstanding of the point of the comment and the original post. Nice, I see what you did there!
I don't think it's a joke, it's a correction of attribution. The quote seems to have been attributed to a lot of people, but earliest mention of similar message is indeed from Blaise Pascal, see https://quoteinvestigator.com/2012/04/28/shorter-letter/
Quote Investigator is a gem. There's another page[1] on a similar quote:
> If it is a ten-minute speech it takes me all of two weeks to prepare it; if it is a half-hour speech it takes me a week; if I can talk as long as I want to it requires no preparation at all. I am ready now.
~ Woodrow Wilson, as quoted in The Operative Miller 23