To explain who solved what (I copied from here: https://x.com/IlinVasily29521/status/2097554700321329393 )

  Tristan + Levent: 3D incompressible Euler with forcing
  OpenAI: 3D incompressible Euler without forcing
  OpenAI: Navier-Stokes with forcing
  No one: Navier-Stokes without forcing

Euler equations = Navier-Stokes without viscosity. Forcing means external force. Absence of viscosity and presence of external force make blowup easier to construct.

Tristan+Levent ticked the weakest case, OpenAI ticked the two next weakest, then the final case is unsolved. Only the last two are eligible for the Millennium Prize. The Navier-Stokes general case remains unsolved.

Tristan and Levent only solved the easiest version of the problem and did not have the key insights to solve the harder versions of the problem required for the Millennium Prize.

The researchers didn't even solve the same problem as OpenAI, so your argument doesn't hold up.