Yeah I can't imagine why they would need a 200W tube amp. If they are solid-state or hybrid I could almost imagine it, but a 120W tube amp is as loud as a 200W solid-state amp in my experience. But I see no indication that this company has any reputation for solid-state stuff, and indeed seemed to fold up when solid-state became cool and has only reappeared when high-gain tube amps are the thing.
Daniels must gave abused his ears playing in Asphyx for all those years with that buzzsaw sound, maybe he needs the extra volume? I don't know. I do know that his sound does rely a lot on brute force, literally pounding the listener into submission. Maybe he thinks more is better? I don't know. I've only seen clips of them playing live but they didn't sound dramatically louder than bands playing 120W amps. You can see the amps behind them in this clip.
Grand supreme blood court- Fed to the boars live @ Summerbreeze 2013It might also be the case that it was an error in the transcription of the interview. He might have said that 'we use two hundred watt amps', meaning him and Alwin use an 100W Bulldog each. They look like the old Bulldog amps in the video, which were 100W. Unless they have recently built prototypes that have double the power amp capacity, I'd say they were 100W Bulldogs, which pre-date Meso Rectos but have a similar look without the high-gain sound. I'm pretty sure their extreme gain comes from pedals