That forced me to actually go learn Pinyin and learn about the j/q/x consonants. It took me about 2 months of obsessive practice to fix all the wrong pronunciations I taught myself from 1 month of Pimsleur.
I think for any non Western European language, it’s much better to learn the basics the old fashioned way, especially the writing system and all the phonetic aspects of the language that don’t exist in English.