You don't get paid for 8 hours work, you get paid for working 8 hours

They aren't being paid for the efforts and profits produced by their labors for 8 full hours. They are being paid for being at the company for 8 hours.

Let's say they make 1,000 bits and bobs an hour, which the company sells for $20 each. That's $160,000 worth of product made over the course of their shift. Taking out taxes and operating costs and various overhead, they're still generating a lot of profit. They aren't being paid the worth of the value they create. Instead, they're making $7.25 an hour. It will take them almost 3 hours of work to buy one bit and bob, even though they create 1,000 an hour.

Under capitalism, an hourly wage has no meaning; you are paid to accomplish a task. The faster you do so, the more you make per hour, and vice-versa.

Ubder communism, effort is rewarded, rather than results. Provided you worked for 8 hours, you are paid according to some arcane rule specifying your hourly wage. Results don't matter, only how much time you spent, which is incompetently used as a heuristic for effort.

In this meme, the evil communist overlord is paying someone the communist way, which unfairly gives the overlord an undue share of the profits. The worker was a fool and worked as hard as capitalism would suggest, and is surprised and disappointed to be paid the communist rate.