Yes. MBTIonline.com is operated by The Myers-Briggs Company, the exclusive publisher of the Myers-Briggs Type Indicator® (MBTI®)assessment.
The experience uses the MBTI Form M assessment, which you can read more about here.
Keep in mind that the MBTI is not an open framework. Websites that do not bear the MBTI logo or mention a partnership are not affiliated with The Myers & Briggs Foundation nor The Myers-Briggs Company. Many of these sites create a four-letter type output, but we cannot speak to the accuracy of their results nor do we endorse the approach they use to explain the personality framework.