removing action / is_page() not working

I’m not sure I’m right here – I’ve got the problem, that removing/adding an action inside the_content is not working.

Basically, I want to remove the action made by the download monitor plugin
add_action(‘init’,’wp_dlm_init_hooks’);
through the functions.php on all sites BUT the downloads site itself.

If I add

if (!is_page(‘9335’)){
remove_action(‘init’,’wp_dlm_init_hooks’);
}

to my functions.php,
nothing is working anymore at all – it is removed also from id 9335.

How can I solve this? This is not plugin specific – it doesn’t matter which plugin it is that I want to remove the actions from.

if (is_page(‘9335)) { ?>
BLABLABLA
<? }

does display a blablabla anywhere if I add it to my page.php file or to the header.php on that single site. So the is_page IS being recognized, just not, as it seems, INSIDE the the_content() part.

Can you please help?
Thank you, Martina.