Look at the IDs, they are same -> its not multi.
And I don't think that using 1 acc by 2 persons is illegal.
Actually, this is illegal, because its account sharing and that violates the rules. But i guess what you mean was, using an account by the same person more than once at some specific time, yep that is legal.
Also, AFAIK, paintball wouldn't allow 2 different person to join with the same acc and name. I believe it checks IPs, but i might be wrong here, never tested it.