gavra, I don’t see any contradictions. It isn’t saying its okay to prance around bare chested. But ipso facto if he already said kriyas shema like that, the shema was yotza.
Siman Beis is halacha l’maaisa like every other part of SA.
And it is clearly 100% assur for a woman to be untzniusdik in front of a goy or otherwise.