Problems

If the VLTI measurement corresponds to the photosphere of the rotationally distorted underlying B star with no Hα-emitting disk, it should have a nonzero net polarization due to electron scattering in its outer atmosphere.
This is inconsistent with Tinbergen's observation of zero polarization in 1974 at a time when Hα showed pure absorption.
The observational history of correlations between Hα emission and polarization is that of a typical Be star, with the exception of Schröder's measurement of a small negative polarization in 1969–1970 when emission was absent. (???)

If the VLTI measurement corresponds to the photosphere of the rotationally distorted underlying B star with no Hα-emitting disk, it should have a nonzero net polarization due to electron scattering in its outer atmosphere.