What does this purple node mean, and why I can't find it in UE5

Development Asset Creation FX
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Hey all,
I’ve been following an RnD blog about a custom shader and I stumbled upon this node;
image
I couldn’t understand what it does or how I can replicate it, or integrate it in case it’s built in the engine, can anyone help?
The blog post: https://cyn-prod.com/stylized-paint-shader-breakdown

Thanks a bunch <3

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It’s not a real node, it’s a reroute node

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Thank you!

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