These species are probably only negligibly senescent, meaning that they tend to decline rapidly at the end of life and otherwise show few signs of aging up until that point. Lobsters fall into this category, for example. Given that there is exactly one species with good evidence of its immortality - no-one has yet run an equivalent to the rigorous testing of hydra mortality rates in Turritopsis dohrnii - and countless species that clearly age, what are the odds that any given species with poor data is actually immortal? Not so good, I think.
The authors of the paper noted below have an interesting view on why aging is an inevitable outcome of evolutionary processes. To their eyes the declines of aging are an emergent property of competition between classes of cell in multicellular organisms. You might contrast this with the view that aging is a race to the bottom that occurs because environments change, often radically in comparatively short periods of time, and species in which individuals age have a greater ability to adapt to that change than species in which individuals are immortal. Thus aging species out-compete the immortal species in every evolutionary niche over long periods of time. That model has the advantage of predicting that we might see a few immortal species at any given moment, but we should not expect them to last. So while the paper below is thought-provoking, the primary problem I see here is that there is no acknowledgement of the existence of hydra - something of a challenge to a model that presents aging as absolutely inevitable.
In fact, the authors come on very strong with this view of aging as inevitable and beyond our power to defeat in the publicity materials. I have to think that they are quoted out of context and the quotes then assembled by someone who doesn't understand the research, which entirely relates to the evolution of aging, not our ability to intervene in the aging process. How it is we find ourselves stuck in these corroding bodies is a somewhat separate topic from what we choose to do about it - meaning the identification of the best strategies for periodic repair of our failing biochemistry. So I'd say skip the publicity materials, which I think are trying, poorly, to express the idea that there is no way to prevent breakage from occurring in cellular biochemistry, and go straight to the paper. It isn't open access, but the usual way past those barriers works just fine.
https://www.fightaging.org/archives/2017/10/theorizing-that-aging-is-an-emergent-property-of-cellula...
Theorizing that Aging is an Emergent Property of Cellular Competition
Why does aging exist? Why, when we look about the world, can we only find two defensible examples of an immortal species, the hydra and the jellyfish Turritopsis dohrnii? There are a few other species that might be immortal, but the evidence is fairly shaky in near all cases, meaning that it is more of a challenge than is usually the case to show aging, or the data is sparse.
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