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That’s not the only problem, I think. It’s not an adaptation of their work, it’s a “demake” which means it uses original source files or, at best, exact recreations of that work. The other projects people are comparing this to adapted Valve’s work to make something original. This isn’t original and uses the existing name. It would be very easy for Valve to make the claim that this product could be confused as an official Valve product even if most people who are interested would know the difference or be able to tell.
It’s not about whether it competes. It’s about whether a “reasonable person” could confuse it for being an authorized product of the IP owner. In this case, people could confuse it with both a licensed Nintendo product (since it runs on original hardware) and it could be confused with an official Valve release (since the content is an exact (as possible) recreation of the levels and assets from the original game.