who and how left those messages in some mined blocks. Embedding them forever in the bitcoin blockchain?

i just found out about this after reading the jason williams book : hard money you cant fuck with.

in 2 sections of the book he mentioned messages left in certain blocks mined.

first one is a message in the first block ever mined, left there by satoshi himself, the message was a headline from news at the time, something about the 2008 crisis. this message is easy to understand since bitcoin was brand new and satoshi was involved.

but then in 2020 he mentioned that miners left another message in block number 629,999 — the last block of that halving:: "NYTimes 09/Apr/2020 With $2.3T Injection, Fed’s Plan Far Exceeds 2008 Rescue."

Who specifically wrote this message? and how does it get it approved across all miners? clearly someone had to write it.