At this point, I am inclined to assume it was a suspension. It reminds me more of a less-public Rushia situation than Vesper's suspension back in November. Vesper had those account issues that couldn't be fixed earlier in the week before he and Magni went AWOL. Starting to think that when Cover fixed it, they found some shit he and Magni were doing that they shouldn't have been, ala Rushia. The only solace is that Tempus outwardly is not stopping activity after the Vanguard vagueposting. When Vesper was suspended, they all cancelled their streams.
Honestly, Vesper yabai-ing out of the job isn't surprising to me in the least. Dude is seriously unhinged, especially going by stories from his younger years.