Until we figure out how that is possible outside of theory, it is just that. We have no plans that address actually keeping a spaceship working on such a timescale, and keeping the crew alive on top of it.
Considering we haven’t seen any generational alien ships visit, it seems like nobody else has figured it out yet, either.
Like others have pointed out, smartphone photography has improved leaps and bounds and continues to evolve. Bigger lenses enable this.
My main complaint is the off-center design, and lack of options (like a thick variant with a huge battery).