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No, the concept of RNG is clear. Is it a verbal agreement not to rely on luck/abilities, or is it some option in the Conflux of Souls?
Here's another example, regarding a possible battle between a wyvern and a phoenix.
If the wyvern's poison takes effect at least once in the first 5 rounds, the battle is won; otherwise, it's lost. The probability of this event not occurring is 1-(1-1/5)^5, which is approximately 33%. So, it's unlikely, but it's still possible to be unlucky.
More likely, it means that for all elements of the overall gameplay and battles in particular, there exists a strategy for victory that can be implemented with the right conditions, if not always, then at least on the second or third attempt.