Non-HD wallets don't use seed phrases so each key pair is completely independent. For a non-HD wallet, the private key just looks like random letters and numbers.

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With HD wallets, the random letters and numbers generate a few words to remember.

Right, so a 24word guess that worked for some old coins won’t work for the rest that individual owned (comprising their whole “wallet”). Is that basically the idea?

If so, still feel I’m missing something, but I’ll give it a rest for now

Yes you'd need to guess the exact, random 51 alphanumeric characters not just words