Count Number of Months String Contains Based on Criteria

I’m looking for a formula to provide me with a count of the number of months that meet certain criteria.

Here is an example of the cells that would need to be evaluated:

The user will be selecting a month from a drop down. Let’s say they select 2023 October. I will need the formula to count any cell that contains that month or newer. Result should look like this:

Other Notes:

1. The months will always been in order (Recent to Oldest)
2. Format of months will always be 4-Digit Year, Full Month Name
3. Location of user selected month: Let’s say Settings!A1
4. Location of cells to be evaluated: Data!A2:A
5. Location of cells with counts: Data!B2:B

>Solution :

Here’s one approach you may test out:

=map(A2:A,lambda(Σ,if(Σ="",,let(Λ,split(Σ,", ",),countif(Λ,">="&A1)))))

• Adjust ranges in the formula as needed in your sheet