Not sure how much information the social media managers are given, but just weeks ago Anker said they have no plans for QC 4 or 4+ in the near future as there are very few devices that support it...
Who knows... as @nigelhealy has mentioned several times in the past, Anker has and appears to still be too bias to QC tech. Perhaps upcoming smartphone flagships will have a different technology for faster charging (PD). If that’s the case, then Anker wouldn’t have the need to make QC 4 accessories. It would be a waste if there ended up being very little demand.
On the other hand, if they were one of the only major tech accessories manufacturers, they would sell the most due to few options.
My guess is they're thinking solution 1 is more likely.