True, could have worded it better. I still think how I can have the data preserved for more than 100 years, I haven't yet found a way. I did find a few methods but I felt that they would put the privacy at risk. One was using blockchain (which as you told is stupidly expensive) and the other one was using distributed databases like https://gun.eco/ with a few nodes hosted around the world (kinda like nostr).
Even if the platform manages to stay alive for 50 years is a big W in my book! The older generations know about their histories but they never tell the newer generations because time is limited. This leads to the newer generations not knowing their roots.