I have a friend, who own DM920 with Si21692 HYBRID MOD2017/06 (Tuner with MultiStream, but it can't handel S2X)
Of course the Si2169D can handle S2X, too
For example:
Eutelsat 33°East - 12621 V, DVB-S2X/8PSK, SR: 10058, FEC: 25/36 - Transponder was found in blindscan mode with Si2169D (6/2017)
Best regards