Validation for a seed collision Came across this post while researching, and it claims:

This mnemonic: weary weapon unseen like like like like like like like like like and this one: sister glide dude near muse sent like like like like like like both produce the same binary seed (which is this
in hex: 0x1003ca7a7000000000000000000000000) and they both produce
the same address list (starting with
17A2fgCpcKEbg7CbfiJwAb8sjdEzUWD2y2)
4/1000 number comes from this: (# of mnemonic permutations / # of
binary seeds) - 1 == (1626^12 / 2^128) - 1 == about 4/1000. So about 4
in 1000 mnemonics correspond to two binary seeds / two address lists.

Can someone explain/verify the reality of this? Is this true? Applicable to only 12-words mnemonic or to all? Or not valid at all?
When I went ahead and tried to use the 12-word mnemonic provided, I found out that &quot;weary&quot; is not even a word in BIP39 English wordlist, but words are not chosen on the basis of security but rather to reduce human error in reading and transcribing the words. Does the claim hold up? And after reading tons of information on the subject, this is the first and only source that I have seen mentioned mnemonic -&gt; seed collision.
Let's start from looking at electrum's wordlist (same as BIP39 english). From your example words:
weary
unseen
dude
muse
sent

don't exist in this wordlist. There are dune, museum, wear and sentence. Unseen isn't close to any of the words. If the author of the post provide mnemonic in the form of number it may be possible to calculate, from seed there is no way of getting the mnemonic (it's a HMAC function) and confirming his claim.