This looks like the FAA was given access to the VA database of disability payments and then cross referenced everyone on VA disability to the FAA database. I wouldn't be surprised if this is the tip of the iceberg on prosecutions.
Note that all four cases involve mental/headache issues. That's likely round one of these prosecutions.
If you're collecting VA disability and have an active FAA medical, I'd recommend that you call your union's medical staff and talk to them immediately. It doesn't matter if you report everything on your FAA medical, I'd still recommend doing a sanity check on this issue with your union medical staff.