Not exactly, that article is on how to remove a MAS app from Launchpad. If you downloaded it from the Mac App Store it will have an "X" next to it when you follow the directions.
This may help...
May be my english is wrong but i see difference in:
"remove from launchpad"
that is like "remove something from the box" - certainly the thing being removed still exists but is now out of the box, that is 'we remove it from launchpad, not the system', versus:
"delete from launchpad"
that is "delete while operating withing launchpad". With the box example again seems like "delete something while being in the box" that is completely delete a thing (from a computer in that case). But thanks for the link!