The report you mention looks at tblQuickFixEngineering.InstalledOn and the colors are based on how old the date stored in that field is.
You can add the InstalledOn field to the patch tuesday report to get the last installed patch date. You will then also need to use a Group By for all the non-aggregated fields.
Max(Convert(date,tblQuickFixEngineering.InstalledOn)) As lastPatchDate