A sentence to recase
The post gives one sentence, the first line of the top post in a subreddit the author follows: "I posted A similar message to the Basecamp, but had to also come visit you all here on Reddit." The capital A is one letter of the post author's family name. Capitalize the rest of that name the same way and you have the answer.
The solution the author edited into the post says the name is Yang, so it reads "I posted A similar messaGe to the Basecamp, but had to also come visit You all here oN Reddit." Yang again, the name inside the favorite address of block 1.
The chain part
Append the last three characters of the block 1 private key, Uzp, SHA-256 the string, use it as entropy. That's the link that makes it a chain: you can't do block 2 without the key of block 1, and that key was public by then. The post says "Ian Coleman brain wallet tool", but the address comes out of the BIP39 tool at m/44'/0'/0'/0/0, the same route as block 1.
Half an hour
Funded at 06:57:24 UTC, posted at 07:03, swept at 07:32:15 for 682,539 satoshis. The thread has no comments. The author edited the post instead: "Someone has solved block 2 and the funds have been taken", the solution and the WIF.