I can certainly believe that the assurance the US gives to its pilots that they will never be left behind and the public demonstration of that assurance as something the US values in the billions of dollars.

It is also clear that if the mission was not a purely rescue mission then it would have taken a lot more equipment than what appears to have been used. Even for an escalade style high-risk low-probability mission it would be inadequate.

I think the most likely version of the claim would be that the Pentagon would have used the planning and execution of the mission as a valuable opportunity to learn for a dedicated mission to extract uranium in a contestable theatre. But even that is pushing it.

We do not know how much equipment was used.

We know only approximately how much equipment has been lost. It is likely that much more equipment was used than what has been lost, i.e. many more transport airplanes than the 2 lost and many more helicopters.

Nevertheless, I agree that a possible explanation is what you propose, i.e. that the mission could have been more a test of the Iranian defense than an incursion that was actually expected to succeed.

In any case, if it was a test it was also a failure, as the defense was stronger than they expected, leading to excessive equipment losses.