Hi fw10001 i have similar question. Here are my details..

After this PIO-OCI conversion news published, we made a trip to india and landed in BLR back in 2016, the immigration checkpoint has no clue regarding stamping of "Life time validty" on our son's PIO booklet. Luckily i have taken the printout of the publication and after some back n forth moments (almost 2 hours delayed), finally they stamped our son's (minor 12years) PIO card with this Life time validity.
Just now realized ( planning a trip to india) that his PIO card has expired in 2020 when he turned 16. I am not sure whats our course of action..
Should we continue to carry his expired PIO booklet having the "Life time validity" stamp or should we apply again and go thru new OCI process ??

Technically the life time validity stamp should work but my son PIO card has picture of 1 year old when he applied. I dont want any trouble at the immigration that too having connecting flight at DELHI to HYD is only 4 hours..

Appreciate if any one in my situation has any inputs.