Yes, the second toilet at the back (in front of the galley) is gone.
Only one toilet in the front is for pax use. The second on is behind a locked door where crewrest areas are and the cockpit.
I flew BKK-FRA-DUS on Monday night after LH reinstated the night time rotation.
However, I think I will stick to OS BKK-VIE-DUS in future, as I have done in the past 2 years.
LH C is nothing to write home about.