Usually methods that get past the diffraction limit but not through hallucination https://en.wikipedia.org/wiki/Super-resolution_microscopy

But they say they used ML analysis too in the abstract

> Using super-resolution microscopy,25 we characterized their unique molecular composition and dynamics in dissociated neurons,26 enabling Ca 2+ propagation over distances. Utilizing imaging and machine-learning-based27 analysis, we confirmed the in situ presence of DNTs connecting dendrites to other dendrites28 whose anatomical features are distinguished from synaptic dendritic spines