Compatible with flat tops. What isn't said "compatible with button tops" or "compatible with both button and flat top batteries", leads me to believe Provari designed the space in the battery compartment and how the chip is held into place to fit only flat tops going forward.
That's kind of how I thought when I found no reference to both types in the manuals. But DPL says he uses 'both in both' and what Geeky says makes sense too.