The school I am applying to is asking for an optional recommendation letter and they told me they don't call the referee?

I find it weird because normally letters are confidential between the referee and the institution. The school wants me to submit the letter by myself as it was sent by my manager. It means I can read the letter and change it as I want. I asked them and they even told me they don't reach out to the referee as well. Do you think submitting a reference letter makes a difference as they seem not to take letters seriously?

The school I am applying to is asking for an optional recommendation letter and they told me they don't call the referee?
Post Opinion