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Very simple: Instead of making 200 requests, http2 will use a single requests and stream in the chunks continuously. Also noticeable by the pictures not appearing randomly but in the same order they are sent out.

Well, they also appear to be stacking the deck a bit, by configuring HTTP/1.1 in ways that no sane person would (i.e., force-closing the connection after each resource -- HTTP/1.1 already supports re-using the existing connection for further requests, but they're explicitly disallowing that to make HTTP/2 seem better).

Using exactly one connection and multiplexing all the files into it (parallel downloads with only one socket).