Look at the circumscription of Ratzinger's statement and you'll find the answer.
Of course, the restrictions will be widely ignored.
Frankly, I think this is another Abp. Flynn-type situtation, and the Swiss bishops are not relating accurately what was told them, whether that be for reasons of misinterpretation or for other reasons.
The conditions supposedly laid down are nonsensical. Under what "emergency" would a priest be available to offer Mass, but would be unable to give the homily? There are none. This is only another case of dissenters trying to get women in the pulpit.
http://www.kath.net/detail.php?id=9719
One of the funniest parts is this:
Suffragan bishop Paul Vollmar of Zurich told in a radio interview, that during a meeting on liturgical aspects, his German and Austrian colleagues have rebuked the idea to allow homilies by lay people: "Suddenly all of them approached me and said: You Swiss are really the pestilence in Europe."