Yeah. Entangling photons is hard enough, molecules are composed of multiple atoms and are far more sensitive to decoherence because of all the extra moving parts. The fact that they can achieve a measurable entanglement at all is impressive, being able to do it more than 9/10ths of the time is amazing.
To oversimplify for the sake of understanding, they're using tiny tractor beams to very carefully bonk molecules together, causing one or more of their measurable properties to become linked. For example, after linking them we might measure one and find out it's spinning in a certain direction, then because they're linked we'd know the other one is spinning the opposite way without having to measure it. That's entanglement in a nutshell.

[–] gravitas_deficiency@sh.itjust.works 5 points 1 day ago

You gotta trust me; if you look, it’ll break the entanglement.