It was done in bad faith. The Trump administration is well known for this hateful, spiteful behavior. They just have to control everything. No exceptions.
This whole thing with SNAP is an experiment by them. They are trying to introduce "temporary" measures and situations to condition people. The Nixon zombies running the Republican party have dreamt of this opportunity for decades.
If you give SNAP beneficiaries a discount that isn't gov subsidised, all things same everyone not in SNAP might theoretically pay more.
It sounds reasonable, but tinfoil time, unless they normally have people watching this, it feels like the USDA was told or anticipated this.
So much of this gives "Look what you made me do" vibes.