Estimate includes the additional latency you will experience while downloading the post through the mechanism described in the post, which is the only true way to read it.
I've been trying to play with the constants over the years to make the read time estimate more "accurate", but it's a tough nut to crack in general. So I can go over my numbers more accurately, how long did it take you to read it?
fwiw, it took 5m to read. Nb: I was already familiar with a lot of the terms in the post (partly because I've already experimented relaying IP over Cloudflare's DurableObjects instead of S3), and skipped the dialectics.
I wonder if this part is satire, if so, how come? I definitely feel it should be much less.