Rule 22.1A says we must choose as the basis of the heading the name by which the person is commonly known

Rule 22.1B says that the name by which the person is commonly known should be determined from the chief sources of information of his works issued in his language.

Rule 22.2A1 says that if the person is known by more than one name, we should choose the name by which the person is clearly most commonly known, if there is one. Otherwise, shoose on name or form of name according to the
following order of preference:

    (a) the name that appears most frequently in the person's works, or, failing that,
    (b) the name that appears most frequently in reference sources, or, failing that,
    (c) the latest name

We don't know the name by the author is commonly known from the one work by him, because his name doesn't appear in that work in his own language.  It follows from the prescription in 22.1B that we're supposed to be dealing  with works in the author's own language. Since we don't know how his name appears in any other works by him, we can go to 22.2A1(b) immediately and use the name appearing in reference works.