This instance of (MS) SQL Server has been using a process id of X since dd/mm/yyyy
No, this is perfectly normal, as the message says. It is just SQL Server's way of telling you the pid.

To verify, within SQL Server you can do select serverproperty('processid'), and then in the OS space you should be able to check the process ID like this in a one-liner PowerShell command:

Get-Process "sqlservr"