Yes, and dvbs-2 also supports very high modulation and code rates. but they're never used in practice since PSD limits don't allow you to transmit that much due to interference on other systems. starlink is not first in line for most of their spectrum, so they're abiding by direct spectral mask limits. I would guess they're at 16APSK at the highest.
> so they're abiding by direct spectral mask limits
Yes, obtained by channelization and OFDM, not by limiting modulation.
Reverse engineering of the 10 to 12.7GHz band has shown a mixture of 16-QAM and 64-QAM frames. There's a bit of periodic 4-QAM too, which seems to be for acquisition and synchronization.
