Search engines can find and see my hidden forums, categories, threads and psots?

[Goodman_2020]

Hi,

I would like to know something that is very important.

Knowing all my forums and categories are hidden (but accessible, even for the guests, clicking on buttons on header's menu i created - with a link to the part of forum i want included in the buttons) could the search engines see the forums, categories, threads and posts? because to access threads and posts, everything pass through 3 menu bouttons with a link to the good forum inside, the search engin can "click" on the button and then find the threads and hacks and do the same job they will do if my forums and categories were not hidden??

I wont have any problem if i buy vbseo in few months or will it be useless if my forums and cats are hidden?

Thank you, it's very important that i know that