The good thing is, in 2012 the developer Pieter Wuille produced the BIP32 specification at The bottom with the hierarchical deterministic wallets. Jointly with it, Pieter created a mathematical functionality to produce a master key from which to derive all other keys in a deterministic way. This information clarifies BIP39, https://modernbookmarks.com/story18655963/little-known-facts-about-bip39-seed-phrase-list