Why is my admin command script not behaving the way it should be?

For my game, I am trying to make an admin command. Specifically, a command that can change anybody's speed. For now, FE is disabled to see if that was what was causing the script to not work. I tried following this this guide and either I didn't follow it correctly or it's outdated in which I doubt.

Code:

local Admins = {
	"TheOriginalJackie58";
	"BennyBoiOriginal";
}

local function IsAdmin(Player)
	for _,Admin in pairs (Admins) do
		print(Admin,Player)
		if type(Admin) == "string" and string.lower(Admin) == string.lower(Player.Name) then
			return true
		end
	end
	return false
end

local function getPlayerFromName(name)
   for _, player in pairs(game:GetService("Players"):GetPlayers()) do
      if player.Name:lower() == name:lower() then
          return player
      end
   end
end

local function increasePlrSpeed(target, speed)
	if target.Character.Humanoid.Heath == 0 then return false end
	target.Character.Humanoid.WalkSpeed = speed
	return true
end

local function Run(ChatService)
	
	local function processMessage(speakerName, messageObject, channelName)
		local messageText = messageObject.Message
		local isACommand = string.find(messageText, ";speed")
		if not isACommand then return false end
		local speaker = ChatService:GetSpeaker(speakerName)
        local speakerplr = speaker:GetPlayer()
		if not IsAdmin(speakerplr) then return false end
		
		local Arguments = {}
		
		for Argument in string.gmatch(messageText,"[^%s]+") do
			table.insert(Arguments,Argument)
		end
		table.remove(Arguments,1)
		
		local target = Arguments[1] -- Getting the first argument which is the player name
		local targetplr = getPlayerFromName(target) -- Getting the target player from a string
		
		local success = increasePlrSpeed(targetplr, Arguments[2]) -- calling the speed function with parameters targetplr and desired speed
		return success
		
	end
	
	ChatService:RegisterProcessCommandsFunction("speed_command", processMessage)
	
end

return Run