I’ll let Ajahn Brahmali defend his interpretation himself if he wants to. But I’d also be interested in his opinion on the question you raised in the OP as to why jhana is uttarimanussa and why there are conflicting descriptions, superhuman vs samsaric. My attempt at explaining it would be that there is a difference between superhuman states (that transcend the human plane) and super-samsaric states (that transcend samsara altogether). Jhanas are superhuman in the sense that they transcend the kama loka where humans live and are beyond the abilities of an ordinary human being. You need them to totally let go of the defilements of the kama loka and become an anagami. It thus depends on the perspective the Buddha was taking at the time of giving his sermon: Compared to nibbana they are nothing much, but compared to ordinary defiled mind states, they are superhuman.
Probably jhanas are covered by the rule because not everyone has right view and understands their transitory nature. Anything that seems superhuman would bring you a lof of fame and admiration regardless of whether it is useful for nibbana or not.
I guess in the end every monastic has to make up their own mind how to interpret the rules.
As you said so beautifully in response to one of my posts on another thread: