I don't understand what the style has to do with the Delete as Spam feature
Here's what I usually do:
1) Select the post by checking the checkbox.
2) From the bottom moderation drop down menu, I select "Delete Posts as Spam"
3) It goes to this page:
http://i38.tinypic.com/affz48.jpg
4) I select "Ban these users" and usually "physically remove"
5) It then goes to this page:
http://i35.tinypic.com/21jrmgl.jpg
6) I select the checkbox that says "Apply punitive action"
7) I click "Ban user" at the bottom
And then all of his posts get deleted.
However, none of the spam posts are deleted anymore. That is the problem.