Interesting find - when Carl LeBel was on the Tinnitus Talk Podcast he made an interesting comment when discussing cochlear synaptopathy. He was talking about the process of FX-322 working:
"It wouldn't be the first drug if it gets approved, where one didn't fully understand the mechanism of action." (on page 12 of the transcript).
I'm probably just reading too much into this but it's a slightly ambiguous comment and I wonder if it possibly suggests that the drug could also stimulate synapse growth?
That's something I've heard drug scientists say before, and I really wouldn't read too much into it.
Even the mechanism of action for something as common as aspirin is probably not fully understood.