Lol, no. He meant he used to earn probably about $3.5k in practice, and was poached in-house for probably around $6.5k (which is slightly less than twice what he used to earn i.e. $3.5k).

After spending some time working in-house, \with salary increments, he is earning $7k now, which he thinks should be $1k more than what he would have been earning if he stayed in practice (i.e. his pay would have only gone up to $6k in private practice, in the same time he has spent in-house).