There is nothing "diegetic" about inspiration dice. And, it's still one person at the table deciding to change the results, so, whether that one person is the DM or a player doesn't really change the fact that it's still fudging.
I'm just thinking of the first google definition of diegetic, and am imagining the characters literally hearing dice rolling every time there's a reroll now.
Fighter: "What's that sound?"
Rogue: "Well it's either our souls putting out extra effort to alter our fate for the better, or if the gods are for us it could be them altering our fate for the better too."
Fighter: "And if the gods aren't for us in this?"
Rogue: "Do you believe in reincarnation?"
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