Timed-To-Kill Covid Vaccines?

A few corrections from my wife:
Polyethylene Glycol (PEG), not Propylene Glycol, is a petrochemical-based pharmaceutical ingredient used to improve circulation times for liposome-encapsulated drugs by evading the immune system. Additionally, according to the United States Pharmacopeia (USP) nomenclature guidelines, there are only two terms for a tablet or capsule with a mechanism of 'modified release': delayed release (i.e., a drug modified to release later than typical) and extended release (i.e., a drug releases slowly over time). Here are marketing (NOT pharmaceutical) terms used to describe delayed or extended release drugs: CC, CD, CR, DR, EC, ER, LA, SA, SR, TR, XL, XT, XR.