Given that we know nothing about 5th and 6th dimensions, any discussion about whether life exists there will always down to "Maybe it does, maybe it doesn't" -- it's just speculation and pretty pointless. Speculating further that this life is sentient, and further yet that it created us, further yet that it can even sense us, and even more so that it intended to create us is sophistry.
It's pure supposition that "something" made us. There's no evidence. It's no more credible than an explosion of nothing creating matter and time.
As for it not impacting our universe: something made us from the 6th dimension. that's impact.
Even if it was a 6th / 5th dimensional random accident, we should surely want to know a 5th 6th dimensional being who can help / protect us. If it was a 5th / 6th D being that did it on purpose then it definitely had an impact on our universe.
Whilst it would be nice if there was a kindly benevolent 6D being who looks after us, it's just wishful thinking. There is NO evidence.
It made us after all.
You say that like it's a presupposition. There's no evidence of it, there's no evidence of "making". There's just us.
Never say no evidence. There's always evidence.
In fact NdGT puts the odds at 50%.
Involuntary autocorrect in operation on mobile device. Apologies in advance.