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Yes and no....
The focus threaded rod on the Celestron is fixed to the “sled” on which the mirror is mounted.
This means that when the threaded rod is held securely (by the focuser) the sled and hence the mirror cannot move forward and backword
However, there is still some residual slop caused by the operating gap between the sled and the baffle it runs on. This slop cannot be removed (or the sled would bind on the baffle and jam up.) it can be minimized by Re-spreading the grease in the gap between the sled and the baffle.
Hope that helps.
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