Nothing new on this one compared to previous mission 9 runs.

3 assault marines and 1 scout squad plus the Guard forces. The method is to use 2 Assault squads to knock out all the Chaos Temples while waiting for the first Leman Russ to finish repairing. Once done it can clear out the four relic capture points, and then use the 3 assault squads and 1 scout to try to cap as quickly as possible.

See YouTube comment for a little more detail.