Previously, I believed that after a certain point, additional variable input results in a decline in productivity. For example, if you hire too many waiters, they will eventually get in the way of each other, resulting in a decline in productivity.
However, I read online (https://www.amosweb.com/cgi-bin/awb_nav.pl?s=wpd&c=dsp&k=marginal+cost+and+law+of+diminishing+marginal+returns) that "The law of diminishing marginal returns means that increased production of a good requires more and more of the variable input. For example, the first 50 units of production can be had with only 5 workers. However, the next 50 units might required an additional 10 workers. "
But doesn't this contradict with the law of diminishing returns? The law states that as more and more of an input is used, there is a point at which the increase in output is at a decreasing rate. So is the website wrong? Wouldn't increasing even more variable input decrease production even more?
For example, at a car factory, at some point after hiring many workers, productivity decreases. Isn't the website stating that the solution to this is hiring even more workers, which is counter-productive?