Would you really expect them to offer a recommendation that isn't their own product?
I don't have any special inside information. From what I've read, AHF intends to keep select product lines and can still utilize the Armstrong name. Sweet deal for them. The real "magic" is how they side stepped the liability associated with honoring existing warranties. That had to burn some relationships and torque quite a few people.
Reading further, it appears AHF has been buying up quite a few other popular brands as well.
I'm not really sure if the right to continue manufacturing and selling the various associated adhesives were part of these deals or not. So while it seems logical they would say "use Armstrong product X, Y or Z" I think it's completely plausible they streamline and instead say "you can use previously recommended Armstrong products (if available), and if not then utilize AHF adhesives A, B or C".
If they do the latter, this may open up some additional options for the OP that I hope is more budget friendly.
Sadly, the Armstrong adhesive pricing is likely suffering from an influx of rightfully concerned & also over-reacting consumers that is creating an artificially inflated demand of product that is stronger than the current supply, which is driving prices upwards.