From the Soto Zen point of view, which I believe he was referring to when he made this quote, it means that you no longer need to use the tool to find out that you were already in the "enlightened" state all along, and if you keep using the tools then you might end up in a state of delusion about needing to obtain something you already have without needing any tools.
I personally think that I could go on with my life without ever using DMT or LSD ever again, and instead use zen tools exclusively, but I like using these other tools to shut off my ego-mind and fall back into that Buddha-mind state because I already know how to do it without the tools, and it's interesting. I've also started to help others see "the way" using these tools (well mostly LSD) and experiences in nature using koans.
I personally think that I could go on with my life without ever using DMT or LSD ever again, and instead use zen tools exclusively, but I like using these other tools to shut off my ego-mind and fall back into that Buddha-mind state because I already know how to do it without the tools, and it's interesting. I've also started to help others see "the way" using these tools (well mostly LSD) and experiences in nature using koans.