When I was browsing lianglee's (Arsalan Shah) github repository. This component caught the attention of my eye.

https://github.com/opensource-socialnetwork/Argon2iPassword
Is this thing still working or is it implemented in the core of OSSN 7?

I seen something similar in the OSSN Documentation:
https://www.opensource-socialnetwork.org/documentation/view/5534/user-password-algorithm

•Argon2i is optimized to resist side-channel attacks. It accesses the memory array in a password independent order. (2015)
-Wikipedia

•bcrypt is a password-hashing function designed by Niels Provos and David Mazières, based on the Blowfish cipher and presented at USENIX in 1999.
-Wikipedia

Supported algorithms are md5 OSSN v5.x, bcrypt, argon2i. Default is bcrypt.
-OSSN Documentation

My question here is that can I simply switch my whole OSSN installation's hashing algorithm from bcrypt to Argon2i using this component and switch all the current users's passwords from bcrypt to Argon2i. Or if I installed the component only the new users will only use the Argon2i.

Note: I have 0% knowledge on about passwords.