Where did you notice this? The TB-37U was in procurement since FY13. The first newly built ship to get the MFTA was DDG-113 FLIIA, that recently made news by shooting down an ICBM with the SM-3 BLIIA interceptor. All existing FLTI, FLTII and FLTIIA are being upgraded with the new sonar to manage obsolescence of legacy equipment, as are the CGs.I notice that the production of the first TB-37U MFTA is due by June 2021.
But suppose the Chinese Navy starts deploying their own version before this?
Type 054A+ (since 17th boat) have had a dual towed sonar arrangement: H/SJD-311 VDS with active search and a S/SJG-206 towed array for passive search. The same arrangement is present on Type 052D destroyers.