Lengthening telomeres is a naive strategy some chase for longevity. You can think of telomeres as aglets for DNA -- they shorten as you get older. So inhibiting that shortening is good, right?
Well, that does extend life, in a way, but it also slows down DNA repair and makes that a harder thing to access, because now damaged DNA has longer end-caps on it too.
So of course a few years after the whole "Just take telomere lengtheners!" headline wave, another headline wave of "Telomere lengtheners actually can worsen aging!" is a decent followup to expect (something like this happened IRL IIRC).
You can make a similar analogy with stem cells and a limited stem cell pool (do you deplete the pool early, assuming it no longer regenerates at this point, for a boost of apparent vitality, or ration it over the course of a lifetime?)
Homeopathy on the other hand assumes a bizzare, quantum-like "memory" in molecules that has not been shown to be accurate by science, but excels as being a placebo effect.
These are quite different phenomena. It's another way of saying "the dose makes the poison", though in this case, it's "the dose has varying and highly state-dependent effects within a strongly chaotic dynamical system".
