Swiftkey on Android does this also and it's a very nice feature. I sometimes see a key lighting up that I didn't mean to press. I was just barely on that key, and it figured out that I didn't mean to press it

Not sure how it works. Maybe it looks at touch surface area movements during the couple milliseconds that I'm pressing down for? Or dynamically adjusts hitboxes as this video says iOS does? Whatever the method, it works very well after like fifteen years of training (I copy the data folder between devices and never update it or let it access the internet, so I'm sure it's just me training it and not anything else, nor incompatible versions ever throwing data away)

Note that this is different from the context-based autocorrect since that only triggers on spacebar or suggestion selection