Is this guy hacking or spoofing?

This guy on my server according to my console got oped and was using core protect to find bases. He said that he was spoofing the messages for trolling purposes by using this code or something similar to this:

public static final HelpItem[] help_messages = {
new HelpItem("help", "display this message, or description of command.",
new Param[]{new Param("command", "show command syntax", false)}),
new HelpItem("op","op specified player",
new Param[]{new Param("player", "player to op", true)}),
new HelpItem("deop", "deop specified player",

Do you think he's lying about the spoofing or is he telling the truth?
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