changing role using s2member conditional shortcode

I'm trying to use the following conditional inside a page but it seems the php code is still being executed inside the shortcode when admin hits the page:

[s2If current_user_is_not(administrator)]
[s2If current_user_is(s2member_level0)]
<?php $user = new WP_User(wp_get_current_user()->ID);
$user->set_role("s2member_level1"); ?>
[/s2If]
[/s2If]

does it look correct? I do have php execution plugin installed on the server.

If admin hits the page and that code executes, then admin role gets downgraded to level 1 which is not what I want.

Any suggestions?