Can you link? I’ve read this whole thread and only read someone saying they saw availability. But if they were to try to checkout, they’d get an error message as those web sites use the same pool of tickets from Disney’s ticketing backend. I did see someone post they did this at some point but did not state it was this year. When it’s sold out by Disney, it’s sold out except for these in person tickets.
I think it was me who mentioned seeing availability on a reseller.
The reseller I use is Klook, but this may not be at all relevant to someone living in the USA as I'm not sure if they market/sell to the USA. (I don't live in the USA, Klook is a widely used online tour company where I am, and I get payment discounts buying stuff with them due to Klook promotional tie ups with the banks/credit cards I use here).
I've been monitoring Klook availability for MNSSHP over the last few days (mainly as was thinking of perhaps trying to get a second MNSSHP party ticket - though they've now sold out of the other date I wanted).
The availability there does not mirror the availability on the WDW website - e.g. up until yesterday they still had availability for some adult and child tickets for some August dates (which sold out days ago on WDW) and in fact still have child (but not adult!) tickets for two of the August dates. They currently still show availability for 4 September which is sold out on the WDW site. Some of the September dates and October 31 are no longer available on Klook.
My experience with buying my MNSSHP ticket from Klook last week was that I paid online and they emailed me a voucher almost immediately, which I was able to use to immediately link my MNSSHP ticket to my
MDE. But of note, my MNSSHP party date still has ticket availability.
Taking both of these together (availability different from WDW website, tickets being available immediately) I suspect that they probably have an allocation of tickets to resell that is different from being direct from WDW - though this is just a suspicion and I don't actually know the mechanics of how ticket resellers work!
Anyway, just posting about this in case this is at all helpful.