Clarity on forms in content page restricted by access groups

Thank you! We’re using a landing page w/ an access group as a portal to collect information from clients. Just to make sure my understanding is correct - if they’re added to the access group, can the information on that contact record be displayed using dynamic pages correct? So even if I can’t prepopulate the information with what we have “on file”, I could at least do something like “here’s what we have on file, use this form for any updated info”, and since they have access based on a contact record, anyone “logged in” would see their current info?