Hi @nino88,
Yes, WP_Query won’t work with options page because it isn’t a post. Please take a look at this page to learn more about WP_Query: https://codex.wordpress.org/Class_Reference/WP_Query.
WP_Query is a way for WordPress to get your posts or custom posts. A repeater is a custom field that you can add inside posts, custom posts, options page, etc. So you can use WP_Query to get the posts you want and then get the repeater inside that posts using have_rows() function. This page should give you more idea about it: http://www.advancedcustomfields.com/resources/repeater/
I hope this makes sense.
