is_site_admin errors

Hi, I'm getting this sort of error:

PHP Fatal error: Call to undefined function is_site_admin() in ....\wp-content\mu-plugins\mass-mailer.php on line 233

I've noticed it on support system, mass mailer, and update notifications.

Simple fix: find/replace is_site_admin with is_super_admin

did they depreciate this in 3.0.2? I updated just before installing this, but is_site_admin is a pretty important function, I'm surprised if they did and didn't add compatability!