That is because Universal Email isn't updated to work with MySQLi recordsets yet.
You can do it by manually adding code above the email but below the recordset to create an array like:
$colArray = array();
for ($x=0; $x<sizeof($rsMSQLiEmailList->Results); $x++) {
$colArray[] = $rsMSQLiEmailList->Results[$x]["ToEMail"];
}
Then update where it sets the recipients on line 27:
$RecipArray[$CurIndex ][] = "".((isset($_POST["ToEMail"]))?$_POST["ToEMail"]:"") ."";
to:
$RecipArray[$CurIndex ] = $colArray;