He has been banned, however I don't think you can accuse somebody for cheating in the forums.
FOG of WAR: What's the SOP for the cheater player of chess.com
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How can you see if someone is cheating in FOG?
You can't know/see for sure if someone is cheating or not. It the work of chess.com to verify and take action. You can just report that account is you suspect that it might be cheating.
Now the question, how you suspect?
Answer is simple,
1. If some one has made a new account and have played only few games and has high rating.
In that case maybe this person may have played before and for some reason has made a new account and playing with it. "CASE of multiple account". You can report this to chess.com.
2. If some one has made a new account and have played only few games and has high rating, in addition to that another account is spectating the game and is also newly made one, probably with the same country. And playing all the right moves.
In this case, check its archives, if he have more than 90% win rate. Then that's 99% chance that "CASE of cheating with spectator". Report to and block that account.
3. Few player genuinely good player of FOW, just enjoy their games and learn. 
Check their archives, they will have Win/loss, a mix bag with a better %.
There is this player cheating in FOG. I reported it to the chess.com 4-5 days ago. but this ID is still active and he took away my points, reported again.
So I want to know if anyone knows how to report properly or if I did correctly then in how many days chess.com do something about it.
Also there is too much lag in FOW. Do something chess.com, for BOTH.
p.s. posting link to the ID.
https://www.chess.com/member/simoncastellanosacero