Why is the site not showing up in Google search results?

Question

Google

The site fell off for a while and at the entrance began to issue a 500 error. This has been fixed, but now it has disappeared from Google search results for keywords.
If you search for a site using "site:domainname.com", then the pages of the site are displayed in the results. Do I understand correctly that this means that the site is not banned?
ps: until recently the site was displayed in search results on 1-2 pages

Answer 1

Google managed to notice the 500 error and began to believe that the site was buggy.
The site is not banned, but lost ground.
And now it will take time to redeem itself before Google.