It would be reliable if we don't take into account the environment, and if we are comparing two genetically identical persons.
First, because there are many other factors that can cause genetic mutation and consequently shorten lifespan.
Second, giving an extreme example and not taking into account the environment and modern medicine, we cannot expect a hemophilic to have the same lifespan as a non-hemophilic.
More, not all the individuals have the exactly same rate of cell division thus, two persons with the same telomere length can have slightly distinct ages, and consequently die at different ages.
I would say, it is not 100% reliable since there are many other factors to take into account, but it could give a rough idea of lifespan
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