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What makes you think they're using MD5 anywhere?

Even if they were, it wouldn't matter, because NeuralHash is non-cryptographic by design.

I looked at the link and looked at the output from the algorithm for the 2 images which was a MD5 hash. so from that :)

But it isn't MD5. It's not even the same length as an MD5 hash. I am confused by your reasoning.