The blue part could erase paper!

It could destroy paper when that was attempted as I recall.

They are wrong. The blue part is for snacking on. It tastes like blueberries.

Non shit post info is that both sides are for pencil. The blue side is for heavyweight paper, and the pink is for regular paper.

Yes, it does. But only the right ink on the right paper.

If you look closely at that picture, the red part has a picture of a pencil tip on it and the blue has a pen. Make of that what you will.

Erasers for pen exist and work fine if you're writing on good quality paper. They're basically an abrasive that physically removes some of the paper and the ink along with it. IDK about the one in the post but the Pentel ZE32-Y works pretty well.

So, red pill vs blue pill, but you get a bit of both?

Well it looks like you get more red than blue, but you're still partly grounded in reality at least.

Which reality is up to the green eraser to decide...