What is the message showing MIMO usage?

Hi Experts,
How can we justify 50 Mbps max pdsch throughput for 600 Mhz band 15Mhz BW FDD?
Will 5G mimo have anything to play here?

Check rank 1 and rank 2.

Still Tx part is a question.
Heard MIMO won’t go over 2x2 for 5G for now?

This testing have done in busy hour which normally have high traffic and number users.
If single user, check RF condition.
Should be excellent 25 > SINR with Rank2.