The invite link does not ask for Administrator. It asks only
for the permissions the modules actually use: handing out roles, creating,
deleting and locking channels, deleting messages, timing members out and moving
them between voice channels, as well as sending messages, uploading attachments
and adding reactions. Discord's consent dialog lists every single permission
instead of one blanket “Administrator”.
You can trim them at any time after adding the bot: in your server
settings under “Roles”, open the bot's role and leave it only what you actually
need. It also matters that the bot's role sits above the roles it is supposed to
hand out or take away — and that you add it to any channel with its own
permission overrides.
The full explanation is in the section
Permissions and safety.