[Plugin: WordPress MU Sitewide Tags Pages] Deelets what eaxctly?

I understand that if Sitewide tags posts more than (by default) 5,000 posts to a group blog for showing child posts on a network, it will begin deleting from oldest first.

What if the plugin is set to post to the main blog? Please tell me (please oh please oh please) that it doesn’t begin deleting posts from that blog.

If not, is it just that that function is ignored when the main blog is the target?

http://wordpress.org/extend/plugins/wordpress-mu-sitewide-tags/