No, your forums account is completely independent of your Minecraft account, and as such; a change in username will not affect your forums statistics. Even a change in your forums username does not impact your statistics in any way since these are tracked on your account, rather than an individual username.
Okay thank you for telling me, if you want you can move this post to Help Archives. I do not know how to move it.
Thank you for your thread on a recent issue. The issue has been resolved. This thread has been moved to the Help Archives.
