How do I make a chat message invisible

I’m trying to make a thing in Roblox studio where if I say a certain message, it won’t pop up in chat at all. I have this set as a script, in server script service.

game.Players.PlayerAdded:Connect(function(plr)
	plr.Chatted:Connect(function(msg)
		if msg:sub(1,4):lower() == "test" then
			print("test")
		end
	end)
end)

I found this but it seems to only work with the old chat system