You are correct on Q12 collector voltage error in the documentation. I do not have access to correct that document as it came from someone else.
Here are the two waveforms on either side of R110:
The probe is compensated, so the ripple is from the Si5351. Of course, the higher Vpp is the side closest to the Si5351 (Raduino). This was while connected to a dummy load, so there was no audio on the signal.
Hope this helps