I am in the same situation as you are in. My Surface was purchased in November 2015 and it started flickering a few months ago. Now it's flickering all the time.
I find it really unfair that a problem that wasn't our fault happens right after this artificial deadline, and I'm sure Microsoft knows that most of the problems happen after this date. I'm sure they won't pay out much money, as the majority of us fall outside the deadline.
Is there anything we can do about this? I feel like Microsoft created this policy so it could avoid having to pay for most of these replacements. This shouldn't be allowed. They made a defective product, and they're making us pay for it.