United changes M/Y/B instant upgrades starting August 21st? August 21st no more Instant Upgrades?

Being a former 1k I can understand a little on why in expert mode as a current Silver and maybe no one can I can't see upgrade space on PZ buckets just PN. I booked sbn to ord b class zero confirmation in 1st...
https://www.flyertalk.com/foru....m/united-airlines-mi