That is not true.
Electrum published a seed phrase algorithm before BIP-39 was adopted. Did not use a checksum.
That is a valid seed phrase.
LoneRangir
npub1h9…8qwuj
2023-07-24 01:57:48
in reply to nevent1q…nesj
Author Public Key
npub1h9ldj0lymuktgczfmvgvpcv05gnxup9tgk995xvwc0h5rqdzzdps98qwujPublished at
2023-07-24 01:57:48Event JSON
{
"id": "488e025cd396e5c05cca002e7ff4eb78eab3154f48ecdaedf468245babd3cd6d",
"pubkey": "b97ed93fe4df2cb46049db10c0e18fa2266e04ab458a5a198ec3ef4181a21343",
"created_at": 1690163868,
"kind": 1,
"tags": [
[
"e",
"852e3cbd838d27ca34c947f67c13541e7c09c722487288a9fccaa898b71e5b54",
"",
"root"
],
[
"e",
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],
[
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],
[
"p",
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]
],
"content": "That is not true. \n\nElectrum published a seed phrase algorithm before BIP-39 was adopted. Did not use a checksum. \n\nThat is a valid seed phrase.",
"sig": "2870d48affe99bd14fe83e953acfe3880b1f30f5037047ee2a5098abb135926054e9ab7dec5938f2ef9919988f382f73251a84899e3492af6947873b963ff126"
}