Not once we invent time travel in a few decades.

The full quote with context makes it pretty clear that the author is talking about crossing into interstellar space/leaving the solar system. It certainly could have been better worded though and should be fixed.

“And they have crossed into interstellar space, according to our best understanding of the boundary between the sun's sphere of influence and the rest of the galaxy. They are the first human-made objects to do so, a distinction they will hold for at least another few decades.”

The way I see this is: today, we say that Voyager 1 and 2 were the first.

Imagine that Voyager 3 and 4 are launched next year.

In 100 years from now, people will say that voyager 1,2,3 and 4 were the first.

It's not that voyager 1 and 2 will lose that distinction, but they might share it with others, in the same way that Voyager 2 shares it with Voyager 1 to our eyes.

New hHorizons will eventually overtake them because it had the goal of reaching Pluto in the lifetime of its investigators.

> They have traveled farther and lasted longer than any other spacecraft in history. And they have crossed into interstellar space, according to our best understanding of the boundary between the sun's sphere of influence and the rest of the galaxy. They are the first human-made objects to do so, a distinction they will hold for at least another few decades.

They will be the ones that have traveled the farthest until faster objects catch up and surpass them. It may take time until we send anything faster, and it's going to need time to catch up, so it will take decades.