Hello,
i guess that you are misunderstanding something.
The metainfo does not take nothing and by default does not change nothing, it's an override system that you may or may not use to override certain meta data if this is required for certain links.
If you use the autopopulate button it crawls the real page meta title of your (easyblog) pages. There are no database tables involved at all in this process. If you get the Page title of the blog frontpage it's likely that you have it in the source code for your posts.
Refer to the FAQ:
https://storejextensions.org/faq/opening-the-search-engines-metainfo-dashboard-it-s-empty-why.html
and to the PDF docs for more info about the metainfo dashboard.