The account is not a staff account really. It is an automated computer account. You might bug report it (Help (?) > Report a bug) but it is very possible that it is moving immediately after receiving your move and thus is getting it's move in less than the time reflected in the time graph.
Apparently it is actually possible to move faster that 0.1 seconds; it happens on regular games on occasion.
Chess.com does not like unfair play. I recently discovered that Comp1- Easy, a staff account of Chess.com, uses hack to win his games. I also have definite proof. I was playing a series of 10 second matches with Comp1 and after 2 or 3 games, I started looking at the time coloumn. I was shocked to see that, while I lost time with every single move, Comp1's time bar wasn't even showing, proving his use of some sort of hack.
https://www.chess.com/live/game/2138470215
You can see for yourself that Comp1's time isn't even showing up. Even after 30 moves, Comp1 still had 10 seconds on his clock, the same time we started with. Notice that the game didn't have any bonus time.
I cannot tolerate this! I lost my winning streak and a couple of rating points for this!
UPDATE: As it turns out, it is neither a bug nor hack. My bad. The computer is just too fast.