This is accurate to the current state of the literature since all the described microspecies are currently published as full species and haven’t been formally synonymized by anyone. POWO used to have T. officinale as well as all the microspecies, but it didn’t make sense to have both at the same time. Getting rid of all the microspecies isn’t really an option for them so they had to reject T. officinale at species level.
I’m guessing you’ve read this already but before the Kirschner & Štěpánek 2011 paper redefining T. officinale as a broad concept, apparently it was defined as a microspecies in a different section; T. campylodes in section Crocea (from Richards 1985, which looks like it was attempting to prevent this issue that POWO has). Which means that section Crocea was called section Taraxacum, and the current section Taraxacum was called section Ruderalia…
I don’t know why neither couldn’t just name it as a microspecies in sect. Taraxacum/Ruderalia?