He do not say anything about the AF-C Settings, the setting for energy level and the settings for AF+MF, which are relevant for a functioning focuspriority.
My X-H2s with Firmware 6.0 and the right settings does not show the behavior, he shows in his video. Works fine without such issues.
Otherwise we all know, that the menue of the Fujifilm cameras has many traps and silly defaults. So I think he and other people, who say they have such issues, are lost in space of Fujifilm menues.
That is the biggest issue in my opinion and that is to blame in public, that defaults are crooked and there are hidden interactions between functions like AF+MF and focuspriority.