"Truth suffers from too much analysis."
The audit departs towards their last spot, determined to introduce a stratagem to wrest out of Harkonnen circumscription of their efforts and actually find the postulated secret mining facility. Toward that aim, the Fremen are supposed to be their partners. However, this rests on whether their unlikely companion, Mapes, succeeds in securing sufficient assistance.
The Harkonnen have agreed to host the audit at the Wind Pass with utmost reluctance, listing proprietary secrets of enterprises operating there as one of several 'why nots'. But in the end, Count Fenring had his way and the CHOAM mission could arrive there safely, their Sardaukar detail with them.