For those following this thread... I was able to confirm with Gibson customer support that current serial numbers use the 1st and 5th digits for the year(2xxx0xxxx=2020).
YDDDYBNNN
so for example.. SN 122290122 would be the 122nd guitar built of the 222nd day of 2019 (August 10th)
SN 215701088 would be the 588th guitar built of the 159th day of 2020 (June 5th)
They did not tell me when they switched to this method, but I am sure pohatu771 is right that it has been since 2018.
Thank you all for your input on this mystery.
I do hope Gibson adds this info to their website soon. mrichard27 and I can not be the only ones confused by this.