It is not 100%. I have a 2019 flhxs with the problem. Installed the 90$ rod and it did not work. I machined a relief cut into the bottom of the transmission side cover that the clutch actuator mounts on. I then got ahold of the Harley primary vent kit for 35$ and installed that as well. problem solved.
2017 Tri Glide, 2 more years of Harley ESP. They will not cover oil transfer repair under ESP because the fix (primary vent tube) the Harley recommended repair will be an add on, non stock part. Also stated if trans runs low on fluid, since I know about this, they wouldn't cover trans either. I lookin into if this will constitute a breach of contract??