Sum of all Memory Clerks and Total Server Memory (KB)
Max Server Memory for SQL Server 2019 = Buffer Pool Memory + Non-Buffer Pool Memory.

No, some part of memory allocation for SQL Server 2019 can be done outside of max server memory like ( I would quote from Memory Management Architecture Guide)
Memory for thread stacks1, CLR2, extended procedure .dll files, the OLE DB providers referenced by distributed queries, automation objects referenced in Transact-SQL statements, and any memory allocated by a non SQL Server DLL are not controlled by max server memory.
So you can see some part of memory is allocated outside max server memory so your equation does not always holds true.

Total Server Memory (KB) - The committed memory from the Buffer Pool.

Yes that is the memory committed using memory manager.

Data Cache Memory (KB) performance counter is equivalent to MEMORYCLERK_SQLBUFFERPOOL memory clerk and both represents data cache used size.

No, buffer pool is much bigger, Data cache is subset of it.

If Total Server Memeory (KB) is related to Buffer Pool memory, then why its size (32262 MB) is bigger than Total sum memory clerks altogether (23523 MB) which represents both Buffer Poll Memory and Non-Buffer Pool Memory?

Total server memory includes basically memory used by SQL Server which is almost 31 GB and this will be bigger than sum of the clerks, which is basically 22 GB, because memory clerks do not capture all memory allocations within SQL Server ( They do most of it however).
Let me know if you have further questions.