What you're describing is still technically Heat Death. I'm talking about after that. Technically, if anything can still evaporate, you're not yet at true Heat Death.

But infinity is a larger number than even the exceedingly unlikely probability of Entropy spontaneously reducing, just like there's a finite possibility of all the air deciding to move to the other side of the room without any external actions. Quantum fluctuations can produce stuff from nothing, they just never do with any appreciable probability.

But Infinity swallows up even Heat Death.