See:
FYI:
Passing two –refresh or -y flags will force a refresh of all package databases, even if they appear to be up-to-date.
See man pacman (online version)
That’s like saying,
You: “Hey, are my databases up to date?”
Pacman: “Yes.”
You: “Screw you, update them anyway.”
However, if you just issued a pacman-mirrors command to update your mirrors, -Syyu is fine.
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