  The Ozawa's Intersubjectivity Theorem (OIT) proved within quantum measurement
theory supports the new postulate of relational quantum mechanics (RQM), the
postulate on internally consistent descriptions. We remark that this postulate
was proposed only recently to resolve the problem of intersubjectivity of
information in RQM. In contrast to RQM for which OIT is a supporting
theoretical statement, QBism is challenged by OIT.
