Can website dev see all passwords?

[Deliberate]

Currently my friend said he would make a website for my server, and he did (a nice one)
So my players are all registering on it and stuff but i am very curious

Can he see all the passwords that people register with?
He says he cannot and that i shouldnt worry. Please answer this fast
He says that xenforo blocks all passwords

 

[Paul B]

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