Well, you can tell if there is a change in the entangled particle on the other end, but you have to pick up your telephone and call the other lab and say “I just did something to particle A”. Then they’ll know the change in particle B is due to your manipulation and not some other cause.
Being able to manipulate entangled particles like that is nothing new; it seems the new thing this article is excited about is using an Einstein-Bose condensate, where all the particles are harmonized and acting in unison, like the photons in a laser, so that you can entangle larger and larger groups of particles. But it is standard fare for pop-sci writers to imply that entanglement can be used for instantaneous communication or “teleportation”, etc, because that will interest the general public and get them clicks. In reality, science has a whole theorem developed about why that can’t work:
https://en.wikipedia.org/wiki/No-communication_theorem
Re-read the article, which I misunderstood. They were just reading different property changes, and when they occurred, they occurred in both Bose-Einstein condensates in such a way that it showed entanglement in the two clouds. So it’s just that the entanglement phenomenon is found at a larger scale than individual particles.