According to DOC, he is quoting a "reliable source" that chase will be ending the price protection benefit later this year.
https://www.doctorofcredit.com/rumor-chase-remove-price-protection-policy-later-year/I can only assume that this is due to the recent loads of apps that catch the price changes for you. (chase already requires you to actually sign it, so the apps can't do it all for you.) I believe a few members have already predicted this in the earny thread, as this was quite predictable.