In a nutshell, the statute of limitations is the amount of time collectors can sue you for a debt.
The credit reporting time limit is different. It's the amount of time credit bureaus can report delinquent account information on your credit report.
The statute of limitations on a debt can expire before the credit reporting time limit for that debt expires. In that case, the debt can (and usually will) still appear on your credit report. Furthermore, a lawsuit judgment can remain on your credit report until the statute of limitations if that time period is beyond seven years.