Does Google Search Console count two impressions when your site is in two position in the same search result?

Question

I'm using the GSC API to query data for my site at a Query & page level.

This means I'm getting impression, clicks, position & ctr for each user query that leads to a url on my site.

However, stuff is really not adding up.

One thought I had was If I want to get the total impressions for my site using the GSC data, I can't simply add this data up. Because (actual anonymized data):

Suppose, in 1 particular instance - ie. one person entering Query 1, there is URL 1 on position 1 & Url 2 on position 7. Suppose this hypothetical person clicks on url 2. GSC will record this interaction as:

Thus, effectively double-counting this single user's impression.

Is this an accurate understanding of how GSC handles cases where multiple urls from the same site show up in the SERP?

Answer 1

Google defines things here:

https://support.google.com/webmasters/answer/7042828?hl=en

So you can't really add up rows to get a true total if you are grouping by page.

To add to that, Google does not report all queries. So adding up the rows will typically be a lot less than doing a request for the totals:

https://support.google.com/webmasters/answer/7576553?hl=en