Out of the box FEP provides several channels for delivering definition updates to clients. The three basic options are, updates through WSUS/SUP, UNC file shares and connecting to Microsoft Updates. The procedure in this video presents a 4th option, which further leverages the capabilities and resources of SCCM. Essentially the procedure uses a VBS script running in task scheduler to pull delta definitions from the Microsoft Malware Protection Center, then SCCM bundles them into a package which is then pushed out to your Distribution Points and advertised to your FEP clients (on a re-occurring schedule).
For a more detailed explanation please watch this video. If you have any questions please feel free to make use of the comment section below.