No, the shaft was not uncovered as a result of cutting the thing open. They were able to reach the screw-head with a regular screw-driver, just not turn it. Says right there in the post.
Learn to read, stop spamming people with your shit takes, and sure, let's pretend replying to your copy-pasted bullshit with more copy-pasted bullshit is somehow worse. Anything to feed trolls like you.
They didn't find the screw by breaking the blender. They were able to reach it with a screwdriver before that, just not the right one. They broke it because they were too impatient to find a way to look into the hole and then find, make, or buy the right tool.