They're saying it's in the realm of possibilities, plants *may* be communicating via sound, and this is in the context of a study that shows plants are making noises that can be used to convey information.

They're saying it merits further investigation, not presenting it as a hard fact. To claim that's "wild overselling" and that it doesn't belong in a "high impact" journal is wildly underselling the study. They make sure to use the word "may" in everything they suggest that's not directly backed up by the study.