Sort of embarrassing to be still stuck here. Crash in October 2018. Rapid progress to find the initial facts (SB1/2018 Nov 2018) and to find out what actually failed (SB2/18 Dec 2018), then two years later nothing published. The report is in consultation for some time now, which I take to mean that the lawyers for someone don't like the potential consequences of what it says.
Requiring the swap to LH thread on the rod seems like a "and in any event..." fix to me, as the bearing separating the control rod from the tail rotor drive shaft should not have failed in the first place. No doubt the report says why that bearing failed, as this is the information needed to ensure that t does not happen again. .