No. It's inaccurate because it's a completely different theory that oversimplifies any aspect of Jung's theory and creates unnecessary stereotypes that deviate from what Jung originally wanted to research.
To give an example, in the mainstream MBTI theory the first letter (E or I) indicates a social preference. Specifically, it defines whether you're an extrovert or an introvert. While this may seem deeper than it is,
non-Jungian MBTI sources use this as a primary indicator. That's right, your personal preference in social situations. The fact that you recharge while you're alone or when you're with others. In the Jungian theory,
having an extraverted first function means a totally different thing (more on the functions page). The shallow meaning that mainstream MBTI gives to each part of its dichotomy
is often incompatible with what the Jung theory suggests. The last letter, for example, categorizes people based on the fact that they're mentally messy (P) or not (J). This makes the MBTI questions appear a lot more appropriate
for real life and it isn't a surprise that many companies make their potential employees take a (Myers-Briggs) MBTI test. Without giving too much details here, let's also say that S/N and F/T are not meant to 'fight each other' in the original theory as they
do in the mainstream one. The functions' position is not fixed and their position in each type's stack adds strength to them or decreases it.