Yeah, for some reason they said they validated your debt of $1200,and then submitted the removal of the tradeline to atleast one CRA, and it may take up to 45 days for the changes to reflect on your credit report.
If I were you, id pay that 1200 asap before the collection agency it is with now, or one who receives your debt file in the future, reports it again to the CRA's. Just because you got a miracle here (ive never heard of, let alone seen, a validate for deletion request) doesnt mean it can never creep back in your reports again while the debt is left unpaid