Validation for a 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.