How does Google index Instagram profiles ?

Hi,

I'm looking for forensic about the query_hash value on Instagram, that allows to request at their graphql API. The query_hash is valid for a period of time and change to another value. To find the query_hash, you have to access a javascript lib linked in the header of a target profile on Instagram, and you have to be logged in for that. BUT, how does Google index instagram profiles without being "logged in" ? I don't tihnk they use an API endpoint, because they can't treat each websites case. But, in the /robots.txt, bots aren't allowed to access profiles directly. Then, how does it work ? Does Google index profiles created before the Facebook update that forces members to be signed in ?