I do see now that they update it via a function instead, so the page can remain static when mounting.That would indeed make the md5 check useless if the page is properly implemented (i.e. it gets the correct current_page and next_page variable set). It probably works for the devs currently using it because they don't fully allow applying settings despite not setting these two variables properly. I guess I should remove that parameter from the helper script.
https://github.com/Adamm00/IPSet_ASUS/blob/master/webui/skynet.asp#L325
https://github.com/jackyaz/YazFi/blob/master/YazFi_www.asp#L340