The top 250 has 8 dead projects from 2023. Of those 8, 5 are not dead at all, 1 is alive but has an expired certificate and only 2 (the lowest ranked) are dead. This does not seem like useful data.
That's definitely a red flag, although I'd expect the 2023 data to have a disproportionate number of false negatives relative to true negatives (since the vast majority of 2023 projects are still alive).