The measured phase sat within 2.5% of theory.

A mismatch would have proven gravity and quantum theory directly incompatible.

The Quantum Galileo Interferometer split one atom into a falling path and a stationary one, then compared their phases.

Israel’s team next aims to test far heavier nanodiamonds within four to five years.

How each outlet framed it
Ars Technica
explains 90-year-old quantum-gravity thought experiment now testable - puts atoms in superposed free-fall vs held paths

Sources: Ars Technica