The claim was that it would always be the furthest man made object in the universe. Nothing about it being useful or scientific.
Doubly so if they can now become “the furthest man made object”. That’s massive free marketing.
It may also be exponentially easier to do so in the future, lowering the expenditure needed to make it happen.
It might not be reasonable right now, but, once again, the bar was set at always. That is an exceptionally high bar with very little reasoning behind it.