Hello Marcio,
Yes, you can hide these fields. You need to code to fetch the usergroup for which you don't want to show this data.
Change Invoice Table : Find the path shown below
root/administrator/components/com_payplans/templates/default/_partials/default_partial_invoice_table.php
See attached screen shot.
Remove log section : Find file at the path shown below
root/administrator/components/com_payplans/templates/default/subscription/default_edit.php
Near line no. 171, find below mentioned line of code
<?php echo $this->loadTemplate('edit_log'); ?>
Let me know if you have any query.