A current "pop girl" debuting in the top 10 with a lead single (+ music video debuting in the same week + a radio deal) is hardly an accomplishment

It will fall out of the top 10, probably even the top 20, and never return and probably not even sell 500k. So yes, it's a flop.
I doubt Ariana stans would hesitate to call Drag Me Down (just an example) a flop, though it's far more successful than Focus. Take off your stan glasses.