Wait, wait and wait some more
Simple you wait... until Google drops it the page from it's index which can take several days or even weeks.
It's unlikely that medium had any influence on your rankings drop since Medium’s publication and cross-posting pathways automatically add canonical links to protect your original content posted offsite. This means that Medium can only boost — not cannibalize — your SEO.
Search engines use canonical links to determine and prioritize the
ultimate source of content, removing confusion when there are multiple
copies of the same document in different locations. Sites that publish
an over abundance of duplicate content without indicating a canonical
link may be penalized in search engine rankings.
Medium’s publication and cross-posting pathways automatically add
canonical links to protect your original content posted offsite. This
means that Medium can only boost — not cannibalize — your SEO.
Canonicals work... most likely something else
If your rankings have dropped, I'm willing to bet that it has nothing to do with Medium and your pointing fingers in the wrong direction, but to answer your question, Google does take several weeks for them to full drop articles because unless using error 410 (GONE), they have to ensure that 404 is not temporarily.
Finally, in regards of N/A, just so you know:
N/A is a common abbreviation in tables and lists for the phrase not applicable, not available, or no answer. It is used to indicate when information in a certain table cell is not provided, either because it does not apply to a particular case in question or because the answer is not available.
My point is... N/A does not mean zero.