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Yes.. It's true that with pH below 6.5 it's virtually impossible to kill a fish..
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This is a fact that many may not know about, the tables show clearly that many fears are purely speculative. It's like ghosts, one say one thing, every one gets paranoid. But there are actually no ghosts, at least I don't believe in them!
In an established tank, with a low ph, IMO there is no way for a fish to be poisoned by ammonia.
Having said that, in a new tank, there is a danger of ammonia poisoning if the situation is not well managed. Much depends on the bioload, monitoring, and remedial action.
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Bu one thing hobbyist tends to forget is that nitrite though less toxic han ammonia, gets more toxic with increased pH.. So is it best to keep pH at 7? Although we can decrease the toxicity of nitrite with 0.3% salt concentration..
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There should not be nitrite in an established tank. One must always remember that nitrite comes about from the conversion from ammonia by Nitrosonomas. Nitrospiria is present to convert nitrite to nitrate. They are like twin cousins both Nitrosonomas and Nitrospiria, they exist together in the same filter media. Whatever is converted to nitrite is immediately converted to nitrate.
In an established tank, you don't have a situation whereby ammonia after being converted to nitrite will take time to be converted to nitrate.
You may have a situation whereby there is not enough nitrifying bacteria, in which case, the laggard will be ammonia. Never nitrite IMO. And ammonia is not poisonous as we have already seen, when the ph is kept low.
Having said that, in a new tank, nitrite is the biggest challenge because it takes a long time for Nitrospiria to be established and to reach peak performance in the filter.
But only during tank cycling.