If you add a helper column to extract the month/year from column B with formula in D2: =DATE(YEAR(B2),MONTH(B2),1) copied down.
Then you can create a table of products vs. month/year and use COUNTIFS.
So if table is in J1:O7, then in K2:
=COUNTIFS($A:$A,$J2,$D:$D,K$1)
copied across the matrix.
Note: You can also do it without helper columns.. but then you would need SUMPRODUCT() instead of COUNTIFS() and would be much less efficient.
Where there is a will there are many ways.
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