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I'm more of a coffee drinker but you could probably still use this:
Just run it without coffee in it and you have a carafe full of hot water. I could measure how hot it comes out I guess but coffee is generally brewed ~180F ish
Nice thing is it reports states (Refill Water, Replace Carafe, etc.) so you can have it send reminders to refill it before you go to bed etc
I think the DIY path of least resistance is to get a Sonoff and flash it (requires extremely basic soldering), and mod that to the AC cable of a kettle that will turn on when electricity is applied.
As others have said this doesn't work today and won't work in the future unless Nespresso makes an Alexa skill (they would be stupid not to but don't count on it).
Further as others have said the most expedient thing to do is buy a switch coffee maker and a smart switch
There are Alexa capable coffee makers like this one [link]
But given that it's no longer available I can't say how good it is/was.
This one seems to have wemo which alexa can control:
It's already out. [link]