No, maximising throughput does not necessarily mean maximising
turnaround time.
Throughput is a measure of how many operations can be performed
in a period of time. Turnaround is a measure of how long it takes
to perform an operation.
If you optimize latency and/or overhead, you can increase
throughput and decrease turnaround time.
On the other hand, if you create parallel processing, you can
increase throughput without decreasing turnaround.