satoshi didn't creat blockchain, because blockchain was created 17 years before Bitcoin was born. and with name Time-stamp. time-stamp was created in 1991 by Stuart Haber and W. Scott Stornetta. but not adopted en masse. because it has a common problem of byzantium. and in 2008 satoshi solved this problem with alternative solutions. namely through proof-of-work created by Satoshi, then Bitcoin was born as a verification tool on the blockchain. so make no mistake. satoshi is not creator of the blockchain. but only perfecting time-stamps (now blockchain) that have common problems and solve them with bitcoin.
Satoshi doesn't create blockchain he created bitcoin. If you take a look at the whitepaper it talks about a cryptocurrency. Satoshi never says blockchain was his own creation but he explains how he uses it to make transactions and verify by confirming the transactions with block.
You should read the full document to understand what really create satoshi
https://www.bitcoin.com/get-started/bitcoin-white-paper-beginner-guide