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I don't get in what context multiple interfaces/machines can have the same link-local address. Thanks in advance.

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Two, or more, machines can have the same link-local address in every context, except the one where they are on the same link-local network. Routers strip off the frame from the packet, losing the link-local addresses, in order to route the packets, so the link-local addresses are confined to the link-local network.

For layer-3 link-local addressing, packet with link-local addresses are not allowed to be routed to a different network, so different networks can have the same link-local addressing.

The very name, link-local, really gives you the context where you cannot have the same addresses.

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