Hmmm, that's not what I'm getting from the Feds (at least the ones I deal with in my part of the world), ALL controlled airspace (A,B,C,D and E) is off limits (except with permission), to include Part 101 operations. The rationale was "required equipment" for aircraft (to include Unmanned aircraft under FAR 1), especially those operating within the 30 mile ring of a class B airport.
It should be, but that's not what the law says and it is not really even ambiguous. It's clear if you just consider the Part 101 requirement for flying within 5 miles of an airport - notify the airport. The class of airspace does not affect whether you can fly, unlike under Part 107. They have tried to exclude Part 101 from Class B on the basis that there was an existing rule governing air traffic entering Class B airspace without authorization, but even that is a stretch. The only way they can go after a Part 101 pilot in controlled airspace is either to argue that they are endangering the NAS (that's a Part 101 provision) or that they somehow are not covered by Part 101, and then it just defaults to Part 107 rules.