Again, the words aren't picked. Entropy is used to generate a random number, and that random number is encoded as a seed phrase.
If the random number is generated in a cryptographically secure way, then yes, the probability is the same. The point I am making is that I don't believe the Javascript function crypto.getRandomValues within a browser environment (as is the case with Ian Coleman) will generate truly cryptographically secure numbers.
fred21 misunderstood the process.
Seed phrase is a human-readable version of private key after encoding. We can pick a private key randomly with any tool like with coin, pencil, paper or with a wallet software and it should be picked offline.
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