This is comically incorrect. Even the article plainly states that you need to know ~1500 characters to be considered literate in Chinese, with sixth graders required to learn ~2500 characters. A quick perusal of practically any Chinese-language website (e.g. https://zh.wikipedia.org/) will quickly disabuse you of the notion that there are "only 200+ Chinese ideograms".
You might be conflating "ideogram" with "radical", i.e. components of characters. There's probably a few hundred of those defined, but they're more like pieces of characters rather than whole ones. Combining radicals produces very different characters that have totally different meanings; learning the radicals alone buys you very little.
There are thousands of characters, and you have to know thousands. There are tens of thousands of characters in existence, although only highly educated folks will know anywhere near 10000 characters.
You might be conflating "ideogram" with "radical", i.e. components of characters. There's probably a few hundred of those defined, but they're more like pieces of characters rather than whole ones. Combining radicals produces very different characters that have totally different meanings; learning the radicals alone buys you very little.
There are thousands of characters, and you have to know thousands. There are tens of thousands of characters in existence, although only highly educated folks will know anywhere near 10000 characters.