Quick follow up. I shot some 120p video on the X-H1 using a Fuji 35mm 2.0 with all of the different peaking settings (Off, Low and High) and all different colors (Yellow, Red, Blue, White) and i saw no difference in the aliasing / ghosting.
Then I thought maybe a non-fuji lens would make a difference so tried the same test with a Rokkor 45mm. No difference.
The odd thing is, it almost seems like the processor is sending the peaking data to the recording some how even if it's not turned on. Could be my eyes, or it could be confirmation bias... Maybe the software coding is sloppy, maybe it's the IBIS, maybe I suck as a cinematographer...
TL:DR Turning the peaking on or off made no difference