one goal whose attainment is not only impossible to observe
This part doesn’t sound that unique? It’s typical for agents to have goals (or more generally values) that are not directly observable (cf Human values are a function of Humans’ latent variables), and very often they only have indirect evidence about the actualization of those goals / values (which may be indirect evidence for their actualization in the distant future at which the agent may not even exist to even potentially be able to observe) - such as my philanthropic values extending over people I will never meet and whose well-being I will never observe.
Death not only precludes the ability to make observations but also to make inferences based on indirect evidence or deduction, as is the case with your philanthropic values being actualized as a result of your actions.
This part doesn’t sound that unique? It’s typical for agents to have goals (or more generally values) that are not directly observable (cf Human values are a function of Humans’ latent variables), and very often they only have indirect evidence about the actualization of those goals / values (which may be indirect evidence for their actualization in the distant future at which the agent may not even exist to even potentially be able to observe) - such as my philanthropic values extending over people I will never meet and whose well-being I will never observe.
Death not only precludes the ability to make observations but also to make inferences based on indirect evidence or deduction, as is the case with your philanthropic values being actualized as a result of your actions.
Future causally unobserved facts are accessible from the past via inference from past data or abstract principles. It’s called “prediction”.
The fact in question is not just unobserved, but unobservable because its attainment hinges on losing one’s ability to make the observation.