I use these in my own home, and they have a purpose for those who really need them. There are some other community members to use them as well. They’re essentially a little robot finger that does nothing except push an existing button. I do have one on my microwave, but it’s just to push the door open button, which requires more force than I can do (I am quadriparetic). So mine is never used while the microwave is running, just before and after .
My concern though is that I’m not sure they will work in this particular use case.
If I understand with the OP is looking for, they have a microwave which is running in the kitchen with the light on well they themselves are in the living room next-door. They want to be able to turn off just the light without turning off the microwave so that the food will continue to cook but the light will not disturb people watching a movie in the living room.
There are two problems. First, as @Ryan780 mentioned, it’s a very expensive solution. Not only do you have to pay for the micro but, you will also have to buy their bridge device in order to be able to integrate it through IFTTT. And as of 2018 there is now a monthly fee for their cloud service of around seven dollars per bridge.
But the real problem is that if the microwave is running, as @Shoot31 Mentioned, microwaves create a ton of interference while they are running. So it’s quite likely that the signal won’t get through until after the oven turned off, which isn’t what the OP wants ( as otherwise they could just turn off the entire microwave with smart plug) .