Yes, someone may have joined the network at your old IP address but that's ok. That first ARP is going to determine if that has happened already. Am I right?

Yes, someone may have joined the network at your old IP address but that's ok. That first ARP is going to determine if that has happened already. Am I right? The author should try the same ethernet sniffing experiment but put a machine at the old address and see how the algorithm adapts.