because English is an ambiguous language, one that doesn't translate directly into particular meanings. I say this because phrases can have multiple meanings depending on context. "Increased by" is one particular phrase, because there is a difference when you mean to enact upon something (to increase a value by x%) versus displaying the result of a change (the value was increased by x%).
This was never about basic math. It was about an interpretation of English into Math, and I was using the external link to provide an example of an interpretation. Here is another such source that describes perfectly why they can write that it was "increased by 300%" and still mean that it was only tripled, not quadrupled. (e.g. if you increase something by 200%, the end result is that it was increased by 300%)
I was referring to your demeaning comment. Those are quite unnecessary.
