At the end of the day, the intent (regardless of how Mendez's line ended up reading) was that Pike was around 34 (Kirk's Deadly Years age) at the time of the Cage in 2254. So that is clear cut birthyear of 2220 for Pike, or as the novels put it, 2219. And it seems the Discovery writers destroyed this intent with their new line implying Pike being Georgiou's classmate (and her age and academy attendance years are already canon per an on-screen datafile).
The entire premise of the Menagerie of Pike being disabled WAY before his time is also lessened as Pike is now canonically 65 as of the Menagerie now. Yes a 65 year old still has a Starfleet career ahead of him, but still 17 years less than a 48 year old would have.
I'm really hoping this line is a "Chekhov's gun", so to speak, and that Pike brings it up when he triumphantly exposes Mirror Georgiou as an impostor, saying "The real Georgiou would know I was never a student at the academy at the same time as her."