Does pre-2017 also mean pre-T1? TFA mentions T2 is "safe", and it was my first thought that anything pre-T1 was being nuked. Too bad they don't mention that at all. 2017-2019 does feel like the T1 era, roughly.
The MacBook Pro (2016, 4 Thunderbolt ports, with Touch Bar) does have a T1 chip and is dropped, but the MacBook Pro (2017, 2 Thunderbolt ports, no Touch Bar) does not have a T1 (or T-anything) chip and is still supported in Ventura.