I agree that FINRA doesn't approve mergers. It was clear back in May that $PLPL and ByoPlanet made the deal and it was a clear transaction. They must be going for the name and ticker change with them. That would explain the time frame we are seeing.
Check the "FINRA Daily List" https://otce.finra.org/otce/dailyList Type PLPL in the symbol box and select a date range. There have been NO announcements going back to 2019.
You correctly reported FINRA's position on these matters. However one must carefully read exactly what FINRA says---
In short, FINRA's role appears to be informational (i.e. reporting "announcements") regarding corporate actions. So while it's not their job to police the legal compliance of such actions-- it surely is someone's job--most likely OTC and/or the SEC. Otherwise there would be no hang up.
Therefore, it seems clear to me that until the regulatory agency whose job it IS to make sure a company is in compliance gives the green light there will be no announcement as such from FINRA.