redmatrix is no longer considered a supported platform and will not be listed in pubsites as of 2.x

Zotlabs/Lib/System.php

@@ -54,5 +54,11 @@ class System {
 		return '0.0.0';
 	}
 
-
+	static public function compatible_project($p) {
+		foreach(['hubzilla','zap'] as $t) {
+			if(stristr($p,$t))
+				return true;
+		}
+		return false;
+	}
 }

Zotlabs/Module/Pubsites.php

@@ -36,7 +36,7 @@ class Pubsites extends \Zotlabs\Web\Controller {
 				$o .= '</tr>';
 				if($j['sites']) {
 					foreach($j['sites'] as $jj) {
-						if(! $jj['project'])
+						if(! \Zotlabs\Lib\System::compatible_project($jj['project']))
 							continue;
 						if(strpos($jj['version'],' ')) {
 							$x = explode(' ', $jj['version']);